Past Mock Calculations and Equations

Question 1

Calculate the pH of a 0.003M solution of phenolphthalein given that the Kb for phenolphthalein is 6.65 x 10 to the power of -4

Answer 1

n

Question 2

A bottle of vinegar is labelled 4.5% (w/v) ethanoic acid (CH3COOH) .
The dissociation constant Ka, for ethanoic acid is 1.8 x 10 to the power of -5.
Calculate the approximate pH of the vinegar solution

Find the concentration of a sulphuric acid (H2SO4) solution which has the same pH

Answer 2

n

Question 3

The value of the dissociation constant Ka for ethanoic acid is 1.8 x 10 to the power of minus five

Calculate the pH of a 0.05M solution of ethanoic acid

Answer 3

h

Question 4

If the value of Kw at 25 degrees is 1.0 x 10 to the power of minus 14

Calculate the pH of pure water at this temperature

Answer 4

h

Question 5

Calculate the pH of a 0.2M nitrous acid (HNO2) solution given that the dissociation constant Ka for nitrous acid 5.0 x 10 to the power of -4

What is the pH of a nitric acid (HNO3) solution of the same concentration?

Answer 5

h

Question 6

Calculate the pH of a 0.003M solution of phenolphthalein given that the Kb for phenolphthalein is 6.65 x 10 to the power of -6

Answer 6

h

Question 7

A bottle of vinegar is labelled 3% (w/v) acetic acid (ethanoic acid)
The dissociation constant Ka, for ethanoic acid is 1.8 x 10 to the power of -5.
Calculate the approximate pH of the vinegar solution

Find the concentration of a nitric acid (HNO3) solution which has the same pH

Answer 7

h

Question 8

A bottle of vinegar is labelled 4.5% (w/v) ethanoic acid (CH3COOH) .
The dissociation constant Ka, for ethanoic acid is 1.8 x 10 to the power of -5.
Calculate the approximate pH of the vinegar solution

Find the concentration of a sulphuric acid (H2SO4) solution which has the same pH

Answer 8

h