pH, Ka and buffer solutions

Question 1 of 10

The pH of 0.01 mol/dm³ HCl is 1.

Question 2 of 10

Adding water to a buffer solution changes its pH greatly.

Question 3 of 10

Calculate the pH of a solution with [H⁺] = 10⁻¹ mol/dm³.

Question 4 of 10

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

Question 5 of 10

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

Question 6 of 10

Ethanoic acid, CH₃COOH, has Ka = 1.8 × 10⁻⁵ mol/dm³ at 25 °C. For a 0.2 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 7 of 10

pH is defined as

Question 8 of 10

The pH of a solution with [H⁺] = 10⁻² mol/dm³ is ___.

Question 9 of 10

A strong acid has a large Ka value.

Question 10 of 10

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