Category: Chemistry

M6S9 – Organic Summary

Organic Summary

1 / 10

Free-radical intermediates in the reaction of chlorine with methane include:

(i) CH₃^.

(ii) H^.

(iii) Cl^.

(iv) C^.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

The rate equation for the reaction of hydroxide ions with 2-bromo-2-methylpropane takes the form:

rate = k[C₄H₉Br].

This indicates that:

(i) the rate determining step involves hydroxide ions

(ii) doubling the concentration of the halogenoalkane doubles the rate of reaction

(iii) the reaction takes place in one step

(iv) the reaction takes place by the S_N1 mechanism (a 2 step mechanism)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

When ethene reacts with bromine in the presence of aqueous sodium chloride the organic products include:

(i) CH₂BrCH₂Br

(ii) CH₂BrCH₂Cl

(iii) CH₂ClCH₂Br

(iv) CH₂ClCH₂Cl

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Which of these reagents are nucleophiles?

(i) Br₂

(ii) NH₃

(iii) NO₂⁺

(iv) CN^-

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Which of these reactions involve heterolytic bond breaking

(i) propene with bromine

(ii) benzene with bromine

(iii) bromobutane with ammonia

(iv) ethane with bromine

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

The reaction of benzene with ethanoyl chloride in the presence of aluminium chloride

(i) involves CH₃-CO⁺ as an intermediate

(ii) forms C₆H₅-CO-CH₃

(iii) is a substitution reaction

(iv) involves nucleophilic attack on benzene

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

The nitrating agent for benzene is a mixture of concentrated sulfuric and nitric acids. This mixture produces:

the free radical NO

the nucleophile NO₂^-

the free radical NO₂

the electrophile NO₂⁺

8 / 10

When propene react with hydrogen bromide the main intermediate is:

CH₃-CH₂-C⁺H₂

CH₃-CHBr-C⁺H₂

CH₃-C⁺H-CH₂Br

CH₃-C⁺H-CH₃

9 / 10

The relative rates of hydrolysis for these halogenoalkanes are in the order

C₄H₉I > C₄H₉Br > C₄H₉Cl

This trend correlates with the:

polarity of the C-halogen bonds

energy needed to break the C-halogen bonds

the charges on the halide ions

the strength of the halogens as oxidising agents

10 / 10

NOT ON OCR SPEC. Hint: Esters can be hydrolysed and the initial stage in the mechanism is nucleophilic attack using an oxygen lone pair of the water molecule. RO^- is the leaving group and becomes ROH.

¹⁸O is a ‘radiolabelled oxygen’.

The reaction of ethyl ethanoate with H₂¹⁸O produces:

CH₃CH₂CO-¹⁸OC₂H₅

CH₃CH₂-¹⁸OH

CH₃C¹⁸O-OH

CH₃CO-¹⁸OH

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M6S8 – Organic Mechanisms

Organic Mechanisms

1 / 10

Which statement helps to explain why propene react with hydrogen bromide to form mainly 2-bromopropane and much less 1-bromopropane?

this is what Markovnikov's rule predicts

the double bond in an alkene consists of a sigma bond and a pi bond

CH₃CH⁺CH₃ is more stable than CH₃CH₂CH₂⁺

CH₃CHBrCH₃ is more stable than CH₃CH₂CH₂Br

2 / 10

Which of these chemical species are nucleophiles with react with halogenoalkanes?

(i) cyanide ions

(ii) hydroxide ions

(iii) ammonia molecules

(iv) ammonium ions

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which of these chemical species are electrophiles which add to alkenes?

(i) bromine molecules

(ii) sulfuric acid molecules

(iii) hydrogen bromide molecules

(iv) sulfate ions

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

In which of these reactions between pairs of reagents is the bond breaking homolytic?

(i) butan-1-ol with sodium bromide and concentrated sulfuric acid

(ii) catalytic cracking of hydrocarbons

(iii) bromine with ethene

(iv) bromine with hexane

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

In which of these reactions between pairs of reagents is the bond breaking heterolytic?

(i) hydrogen bromide with propene

(ii) hydrogen bromide and butan-1-ol

(iii) sodium hydroxide with 1-bromopropane

(iv) bromine with hexane

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Which of these changes represents a termination step of a chain reaction?

(i) CH₃^. + CH₃^. -> CH₃CH₃

(ii) CH₃^. + Br₂ -> CH₃Br + Br^.

(iii) Br^. + Br^. -> Br₂

(iv) Br^. + CH₄ -> CH₃^. + HBr

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

In which of these organic compounds are all the bonds non-polar?

(i) 1-bromobutane

(ii) butene

(iii) butan-2-ol

(iv) butane

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

Which of these conversions is an example of nucleophilic substitution?

ethane to chloroethane

ethene to 1,2-dichloroethane

ethanol to bromoethane

ethanol to ethene

9 / 10

Which of these statements defines a free radical?

an uncharged species

a species with an unpaired electron

an intermediate in a multi-step reaction

a species formed by breaking a covalent bond

10 / 10

Methane reacts with chlorine in the presence of ultraviolet light. The reactive chemical species which attacks methane molecules during the reaction is:

Cl₂

Cl⁺

Cl^-

Cl^.

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M6S7 – Organic Synthesis

Organic Synthesis

1 / 10

Step 1:

fractional distillation

heat and catalyst

ultra violet light

combustion

2 / 10

Step 2:

bromine in an organic solvent/u.v.light

hydrobromic acid/reflux

bromine water and heat

sodium bromide and conc.sulfuric acid

3 / 10

Step 3:

ethanolic potassium cyanide solution/reflux

ammonia under pressure/heat

excess aqueous methylamine/heat in sealed vessel

reaction with 2,4-dinitophenylhydrazine (Brady's Reagent)

4 / 10

Step 4:

aqueous sodium hydroxide/reflux

acidified K₂Cr₂O₇ with distillation of product

aqueous hydrochloric acid/reflux

acidified K₂Cr₂O₇ with reflux followed by distillation of product

5 / 10

Step 5:

NaBH₄ in dry solvent followed by addition of acid

H₂/Ni catalyst

Tin metal and conc. HCl

LiAlH₄ in dry solvent followed by addition of acid

6 / 10

Step 6:

relux with dilute hydrochloric acid

heat with acidified K₂Cr₂O₇ with distillation of product

reflux with concentrated phosphoric acid and distil

relux with dilute potassium hydroxide

7 / 10

Step 7:

pass HCl gas through the reactant dissolved in water

pass HCl gas through the reactant dissolved in a cold non-aqueous solvent

chlorine gas and ultraviolet light

addition of chlorine water

8 / 10

Step 8:

reaction with aqueous KOH/reflux

reaction with hydrochloric acid/reflux

reaction with cold concentrated sulfuric acid

reaction with alcohlic KOH and heat

9 / 10

Step 9:

acidified K₂Cr₂O₇ with reflux followed by distillation of product

pass a mixture of the alkene and steam over Cu at 300^o

acidified K₂Cr₂O₇ with distillation of product

water and phosphoric acid/reflux then distil

10 / 10

Step 10:

acidified K₂Cr₂O₇ with reflux followed by distillation of product

NaBH₄ in dry solvent followed by addition of acid

Tollen's reagent (ammoniaical silver nitrate) and heat

Fehlings Solution and heat

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M6S6 – Polymers

Polymers

1 / 10

Which of these procedures is used on a large scale to recover some value from plastic waste?

(i) burning the plastic in incinerators and using the energy to generate electricity

(ii) re-melting the plastic and spinning the melt into fibres

(iii) heating the waste with catalysts but no air to produce feedstocks for the chemical industry

(iv) washing plastic bottles on high-speed automatic machines so that they can be reused.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Which of these factors can make it hard to recycle polymeric materials from domestic waste:

(i) much plastic waste consists of containers which have a very low density,

(ii) it is hard for householders to distinguish one plastic from another

(iii) the presence of pigments and fillers often contaminates the pure polymers

(iv) polymers are so similar that no automatic methods of separation are practicable.

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Mixing poly(chloroethene) with a plasticiser makes is suitable for use as:

(i) window frames

(ii) insulation for electric cables

(iii) water pipes

(iv) waterproof clothing

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Which of these characteristics of polymers accounts for the difference between low density and high density poly(ethene)?

[1] the average length of the polymer chains

[2] the type of intermolecular (interchain) forces

[3] the number and size of bulky side groups

[4] the extent of chain branching

the average length of the polymer chains

the type of intermolecular (interchain) forces

the number and size of bulky side groups

the extent of chain branching

5 / 10

Which of these repeat units gives rise to a polymer which is soluble in water:

-[CF₂-CF₂]-

-[CH₂-CHOH]-

-[CH₂-CHCl]-

-[CHCH₃-CH(OCOCH₃)]-

6 / 10

Which of these polymers would you expect to have the strongest intermolecular (interchain) forces as a result of the presence of polar covalent bonds?

poly(ethene)

poly(propene)

poly(chloroethene)

poly(phenylethene)

7 / 10

The monomer which polymerises to form a plastic which has a smooth, slippery surface and is used to give cooking utensils a non-stick surface is:

C₆H₅-CH=CH₂

CH₃-CH=CH₂

CH₂=CHCl

CF₂=CF₂

8 / 10

What is the repeat unit in the polymer formed from propene?

-[CH=CH-CH₂]-

-[CH₂-CHCH₃]-

-[CHCH₃-CHCH₃]-

-[CH₂-CHCH₃-CH₂]-

9 / 10

Which monomer polymerises to form this polymer?

---CH₂CHCl-CH₂CHCl-CH₂CHCl-CH₂CHCl---

chloroethane

1,2-dichloroethane

chloroethene

1,2-dichloroethene

10 / 10

The formation of a molecules of polythene from CH₂=CH₂ involves many thousands of:

addition reactions

condensation reactions

elimination reactions

substitution reactions

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M6S5 – Amino Acids

Amino Acids

1 / 10

Which of these molecules does NOT consist of one or more chains of amino acids?

(i) The hormone insulin

(ii) The filaments in muscle fibres

(iii) The enzyme in saliva, amylase

(iv) The genetic material, DNA

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

If an amino acid is written as RCHNH₂CO₂H, in which of these amino acids is R a polar group?

(i) HSCH₂CHNH₂CO₂H

(ii) C₆H₅CH₂CHNH₂CO₂H

(iii) HOCH₂CHNH₂CO₂H

(iv) CH₃CHNH₂CO₂H

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which of these amino acids are chiral?

(i) CH₃CHNH₂CO₂H

(ii) C₆H₅CH₂CHNH₂CO₂H

(iii) HOCH₂CHNH₂CO₂H

(iv) CH₂NH₂CO₂H

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Which of these compounds are solids at room temperature?

(i) propane

(ii) propanoic acid

(iii) propylamine

(iv) 2-aminopropanoic acid

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Which of these phrases describes the tertiary structure of a protein?

The sequence of amino acids in the chain

The arrangement of the polymer chain into an alpha helix or beta pleated sheet

The three dimensional folding of the coiled chain to give an active site

The linking of two or more coiled and folded amino-acid chains

6 / 10

The main forces which hold a coiled protein chain into an alpha-helix are:

covalent bonds

ionic bonds

hydrogen bonds

attractions between permanent dipoles

7 / 10

Breaking down a polypeptide into amino acids by heating with dilute hydrochloric acid is an example of:

hydrolysis

oxidation

reduction

polymerisation

8 / 10

In a peptide made up of a sequence of four amino acids the number of peptide bonds is:

9 / 10

Glycine reacts with dilute hydrochloric acid to form:

H₂N-CH₂-CO₂H

H₃N⁺-CH₂-CO₂H

H₂N-CH₂-CO₂^-

H₃N⁺-CH₂-CO₂^-

10 / 10

Which of these formulae represent glycine in aqueous solution at pH 9?

H₂N-CH₂-CO₂H

H₃N⁺-CH₂-CO₂H

H₂N-CH₂-CO₂^-

H₃N⁺-CH₂-CO₂^-

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M6S4 – Amines & Amides

Amines & Amides

1 / 10

In the synthesis of ethylamine from bromoethane, the reaction is performed at a high pressure with a large excess of ammonia. The principal reason(s) for this include :

(i) increasing the rate of the reaction

(ii) to minimise the chance of diethylamine and triethylamine being produced

(iii) to push the equilibrium to the right, away from the ammonium salt towards the free amine.

(iv) to reduce the activation energy for the process

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Examples of polymers that contain the amide bond include:

(i) sugars

(ii) DNA

(iii) Terylene^TM(PET)

(iv) proteins

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

If the paracetamol molecule shown below is hydrolysed in hot dilute hydrochloric acid, what are the main organic products?

4 / 10

If the molecule shown below is hydrolysed in hot sodium hydroxide, what are the main organic products?

5 / 10

Which is the most typical reaction of an amine in organic synthesis?

nucleophilic addition

nucleophilic substitution

electrophilic addition

electrophilic substitution

6 / 10

Which of the following molecules would you predict to be the least nucleophilic?

7 / 10

Which of the following molecules would you predict to be the most basic?

8 / 10

Which of the following molecules would you predict to be the most soluble in water?

9 / 10

Which of the following molecules is/are examples of 2^o amines?

(i)

(ii)

(iii)

(iv)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

10 / 10

What is the systematic name of the following molecule?

CH₃CH₂CH₂C(NH₂)CHCH₃

3-aminohexane

3-aminohex-2-ene

4-aminohexane

3-aminohex-3-ene

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M6S3 – Arenes

Arenes

1 / 10

Which types of change are involved in this sequence of reactions, though not necessarily in the order listed?

CH₃CO-C₆H₅ -> CH₃CO-C₆H₄-NO₂ -> CH₃CHOH-C₆H₄-NO₂ -> CH₃CH(OCOCH₃)-C₆H₄-NO₂

(i) esterification

(ii) reduction

(iii) nitration

(iv) hydrolysis

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Which of these chemical species are electrophiles that react with the benzene ring

(i) Br⁺

(ii) Na⁺

(iii) NO₂⁺

(iv) H₃O⁺

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which of these properties of benzene are associated with the presence of delocalised electrons?

(i) There are no isomers of 1,2-dichlorobenzene

(ii) Benzene is more stable than might otherwise be expected

(iii) Benzene typically undergoes substitution rather than addition reactions

(iv) Benzene reacts with nucleophiles

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

The reaction mixture must be completely dry during a Friedel-Crafts acylation or alkylation reaction to:

avoid the formation of phenols

stop inactivation of the catalyst

prevent addition instead of substitution reactions

keep the rate of reaction under control

5 / 10

What is the main organic product when benzene reacts with 2-iodo-2-methylpropane in the presence of aluminium chloride?

C₆H₅-I

C₆H₅-C(CH₃)₂I

C₆H₅-CH₂CH(CH₃)₂

C₆H₅-C(CH₃)₃

6 / 10

What is the reagent used to convert benzene to nitrobenzene?

concentrated nitric acid

sodium nitrate and concentrated sulfuric acid

concentrated nitric acid and concentrated sulfuric acid

sodium nitrite and concentrated hydrochloric acid

7 / 10

The reaction using a mixture of benzene and ethene in the presence of hydrogen chloride and aluminium chloride produces an important intermediate in the manufacture of:

poly(propene)

poly(chloroethene)

poly(phenylethene)

poly(ethene)

8 / 10

What is the organic product when benzene reacts with ethanoyl chloride in the presence of aluminium chloride?

C₆H₅-Cl

C₆H₅-COCH₃

C₆H₅-CH₂COCH₃

C₆H₅-CH₂CH₃

9 / 10

Heating methylbenzene under reflux with excess, alkaline potassium manganate(VII) which is a strong oxidising agent produces:

phenol

benzene

carbon dioxide and steam

benzenecarboxylic acid (benzoic acid)

10 / 10

What are the reagents and conditions for converting benzene to bromobenzene?

warm with bromine in the presence of iron filings

heat under reflux with sodium bromide and concentrated sulfuric acid

mix with bromine in UV light

shake with aqueous bromine at room temperature

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M6S2 – Carboxylic Acids & Esters

Carboxylic Acids & Esters

1 / 10

The compound CH₃(CH₂)₄CH=CHCH₂CH=CH(CH₂)₆CO₂H is:

(i) a fatty acid

(ii) unsaturated

(iii) called octadec-9,12-dienoic acid

(iv) obtained by the hydrolysis of animal fats

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

During the synthesis of an ester from a carboxylic acid and an alcohol the extent of conversion of the carboxylic acid to its ester at equilibrium increases if:

(i) the alcohol is added in excess

(ii) concentrated sulfuric acid is added

(iii) the ester distills off from the reaction mixture as it forms

(iv) an acid catalyst is added

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which types of change are involved in this sequence of changes (but not necessarily in the order listed)?

CH₃CH₂CH₂OH -> CH₃CH₂CHO -> CH₃CH₂CO₂H -> CH₃CH₂CO₂CH₂CH₃

(i) hydrolysis

(ii) esterification

(iii) acid-base

(iv) oxidation

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Which of the listed liquids reacts with sodium borohydride NaBH₄ in a nucleophilic addition reaction?

(i) CH₃CH₂OH

(ii)CH₃COCH₃

(iii)CH₃CO₂H

(iv)CH₃CHO

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

Ethyl ethanoate is heated under reflux with excess aqueous sodium hydroxide. The resulting solution is distilled. The distillate contains:

ethanol only

ethanol and water only

ethanoic acid and ethanol only

ethanoic acid, ethanol and water

6 / 10

What are the products of the acid hydrolysis of methyl propanoate?

propan-1-ol and methanoic acid

methanol and propan-1-ol

methanol and propanoic acid

propanal and propanoic acid

7 / 10

The reagent which converts ethanoic acid to ethanoyl chloride is:

Cl₂

SOCl₂

NaCl

NaOCl

8 / 10

Excess LiAlH₄ in dry ether (this reacts similarly to NaBH₄ but is more reactive), converts propanoic acid to:

propan-1-ol

propan-2-ol

propanal

propanone

9 / 10

The product of the reaction of ethanoic acid and ammonia at room temperature is:

CH₃CONH₂

CH₃CH₂NH₂

CH₃CH₂CN

CH₃CO₂^-NH₄⁺

10 / 10

How any moles of aqueous sodium hydroxide react with 2 mol of ethanedioic acid?

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M6S1 – Carbonyls

Carbonyls

1 / 10

Which of these compounds are functional group isomers?

(i) CH₃CHCHOH

(ii) CH₃CH₂CHO

(iii) CH₃COCH₃

(iv) CH₃CH₂COCH₃

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

The hydride ion, H^-, is:

(i) a reducing agent

(ii) a nucleophile

(iii) a base

(iv) a free radical

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Reagents which can be used in a test-tube test to distinguish aldehydes from ketones are:

(i) Tollen's reagent

(ii) 2,4-dinitrophenylhydrazine

(iii) Fehling's solution

(iv) sulfuric acid

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

A compound P, C₄H₈O, gave on oxidation an acid C₄H₈O₂. Which of the following are possible structures for P?

(i)CH₃CH₂CH₂CHO

(ii)CH₃COCH₂CH₃

(iii) (CH₃)₂CHCHO

(iv) CH₃CH=CHCH₂OH

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

A sample of propan-2-ol was heated under reflux with an acidified, aqueous solution of potassium dichromate(VI). The resulting mixture was then distilled. The distillate contained:

(i) propanoic acid

(ii) propanone

(iii) propanal

(iv) water

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Which of these aldehydes are isomers of pentan-2-one?

(i) pentanal

(ii) 2-methylbutanal

(iii) 3-methylbutanal

(iv) 2,2-dimethylbutanal

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

The reaction of propanone with HCN in the presence of some KCN is an example of:

electrophilic substitution

nucleophilic substitution

electrophilic addition

nucleophilic addition

8 / 10

Treating ethanal with hydrogen cyanide in the presence of some KCN and then hydrolysing the product with hot hydrochloric acid (which converts a cyano / nitrile group RCN, to RCOOH) produces:

HO-CH₂-CH₂-CO₂H

HO₂C-CH₂-CH₂-CO₂H

CH₃-CHOH-CO₂H

CH₂=CH-CO₂H

9 / 10

Which reagent converts butan-2-one to butan-2-ol?

NaBH₄

HCN followed by HCl_(aq)

Cr₂O₇^2- and acid

Fehling's solution (an alternative to Tollen’s but this is a blue soln to brick red ppt colour change)

10 / 10

Which types of alcohol, when heated under reflux with acidified potassium dichromate(VI), turn the colour of the solution from orange to green?

primary only

secondary only

tertiary only

primary and secondary

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pH Buffer Calculations 3

1 / 10

Calculate the mass of potassium methanoate salt ( Mr of 84.1 ) that would need to be added to 80.0 cm³ of 0.900 mol dm^-3 methanoic acid solution to produce a pH of 4.31

The acid dissociation constant, Ka, for methanoic acid is 1.78 x 10^-4 mol dm^-3

16.2

25.8

20.0

22.0

2 / 10

Calculate the mass of potassium methanoate salt ( Mr of 84.1 ) that would need to be added to 90.0 cm³ of 0.100 mol dm^-3 methanoic acid solution to produce a pH of 3.83

The acid dissociation constant, Ka, for methanoic acid is 1.78 x 10^-4 mol dm^-3

0.890

0.930

0.910

0.870

3 / 10

Calculate the mass of sodium ethanoate salt ( Mr of 82 ) that would need to be added to 50.0 cm³ of 0.100 mol dm^-3 ethanoic acid solution to produce a pH of 5.06

The acid dissociation constant, Ka, for ethanoic acid is 1.70 x 10^-5 mol dm^-3

0.600

0.800

1.00

1.20

4 / 10

Calculate the pH of a solution produced when 0.750 g of sodium ethanoate salt ( Mr of 82 )is added to 50.0 cm³ of 0.100 mol dm^-3 ethanoic acid solution.

The acid dissociation constant, Ka, for ethanoic acid is 1.70 x 10^-5mol dm^-

5.23

5.03

5.43

5.63

5 / 10

Calculate the pH of a solution produced when 0.410 g of sodium methanoate salt ( Mr of 68 )is added to 75.0 cm³ of 0.200 mol dm^-3 methanoic acid solution.

The acid dissociation constant, Ka, for methanoic acid is 1.78 x 10^-4mol dm^-3

5.07

4.97

3.35

5.27

6 / 10

Calculate the pH of a solution produced when 0.205 g of lithium ethanoate salt ( Mr of 66 )is added to 100.0 cm³ of 0.100 mol dm^-3 ethanoic acid solution.

The acid dissociation constant, Ka, for ethanoic acid is 1.70 x 10^-5mol dm^-3

4.07

4.67

4.46

4.26

7 / 10

Calculate the pH of a solution produced when 0.150 g of sodium ethanoate salt ( Mr of 82 )is added to 50.0 cm³ of 0.100 mol dm^-3 ethanoic acid solution.

The acid dissociation constant, Ka, for ethanoic acid is 1.70 x 10^-5mol dm^-3

4.13

4.33

3.93

3.73

8 / 10

Calculate the pH of a solution produced when 28.0 cm³ of 0.100 mol dm^-3 potassium hydroxide solution has been added to 94.0cm³ of 0.100 mol dm^-3 hydrocyanic acid solution.

The acid dissociation constant, Ka, for hydrocyanic acid is 6.20 x 10^-10 mol dm^-3

8.84

8.64

9.04

9.34

9 / 10

Calculate the pH of a solution produced when 35.0 cm³ of 0.280 mol dm^-3 sodium hydroxide solution has been added to 75.0cm³ of 0.300 mol dm^-3 phenol solution.

The acid dissociation constant, Ka, for phenol is 1.00 x 10^-10 mol dm^-3

9.89

9.69

9.49

9.29

10 / 10

Calculate the mass of lithium fluoride salt ( Mr of 25.9 ) that would need to be added to 50.0 cm³ of 0.500 mol dm^-3 hydrofluoric acid solution to produce a pH of 3.00

The acid dissociation constant, Ka, for hydrofluoric acid is 6.60 x 10^-4 mol dm^-3

0.427

0.435

0.417

0.395

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