Titration curves pre-lesson check

A solution of CH₃COONa is

• acidic

• neutral

• basic

A solution of NH₄Cl is

• acidic

• neutral

• basic

Calculate the pH of 0.125 mol dm^-3 solution of CH₃CH₂COONa, given that K_a of CH₃CH₂COOH is 1.35x10^-5.

Leave your answer to 3 sf.

Which of the following pairs of substances will form a buffer solution?

• HCl and NaCl

• CH₃COOH and NH₃

• NaOH and NaCl

• NH₃ and (NH₄)₂SO₄

Which of the following solutions has the greatest buffering capacity?

• 1 dm³ solution containing 1.0 mol CH₃COOH and 1.0 mol CH₃COONa.

• 1 dm³ solution containing 0.5 mol CH₃COOH and 0.5 mol CH₃COONa.

• 1 dm³ solution containing 0.3 mol CH₃COOH and 0.7 mol CH₃COONa.

• 1 dm³ solution containing 0.7 mol CH₃COOH and 0.3 mol CH₃COONa.

There are buffering regions found in all titration curves.

• True

• False

Sketch on the axes below the titration curve when 40 cm³ 0.5 mol dm^-3 NaOH is added to 20 cm³ 0.5 mol dm^-3 CH₃COOH.

The titration curve is obtained when NaOH is added to CH₃COOH.

Which substance is/are present in the solution at point A?

• CH₃COOH

• NaOH

• CH₃COO^-Na⁺

• CH₃COOH and CH₃COO^-Na⁺

The titration curve is obtained when NaOH is added to CH₃COOH.

Which substance is/are present in the solution at point B?

• CH₃COOH

• NaOH

• CH₃COO^-Na⁺

• CH₃COOH and CH₃COO^-Na⁺

The titration curve is obtained when NaOH is added to CH₃COOH.

Which substance is/are present in the solution at point C?

• CH₃COOH

• NaOH

• CH₃COO^-Na⁺

• CH₃COOH and CH₃COO^-Na⁺