pH Buffer Calculations 3

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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

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

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

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 / 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

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

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

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

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

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

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