pH, Ka and buffer solutions

Question 1 of 10

A strong acid has a large Ka value.

Question 2 of 10

The pH of a solution with [H⁺] = 10⁻⁵ mol/dm³ is ___.

Question 3 of 10

Ethanoic acid, CH₃COOH, has Ka = 1.6 × 10⁻⁵ mol/dm³ at 25 °C. For a 0.05 mol/dm³ solution: (a) write the expression for Ka, (b) calculate [H⁺], (c) calculate the pH, (d) calculate the percentage ionisation. (e) Explain why this acid is described as weak.

Question 4 of 10

The pH of a solution with [H⁺] = 10⁻⁶ mol/dm³ is ___.

Question 5 of 10

A basic buffer can be made from

Question 6 of 10

Blood is kept at a pH of about 7.4 by

Question 7 of 10

The acid dissociation constant, Ka, for HA ⇌ H⁺ + A⁻ is

Question 8 of 10

The pH of a solution with [H⁺] = 10⁻⁴ mol/dm³ is ___.

Question 9 of 10

pH is defined as

Question 10 of 10

Calculate the pH of 1 × 10⁻⁴ mol/dm³ sodium hydroxide solution at 25 °C.