Topic 6.1: Proton Transfer Reactions Questions

Write a balanced equation for the reaction of zinc carbonate, ZnCO₃, with dilute nitric acid, HNO₃. [2]

Dilute sulfuric acid is added to solid copper(II) oxide, CuO, and the mixture warms and turns blue.

(a) Name the type of reaction and the salt formed.

(b) Write a balanced equation for the reaction. [3]

Hydrogensulfate, HSO₄⁻, is amphiprotic.

Write an equation to show HSO₄⁻ acting as a Brønsted–Lowry base in water, and identify its conjugate acid. [2]

For the equilibrium CH₃COOH + H₂O ⇌ CH₃COO⁻ + H₃O⁺, identify the two conjugate acid–base pairs and state which species is the Brønsted–Lowry acid on the left-hand side. [2]

A sample of rainwater is found to have a hydrogen-ion concentration of 2.0 × 10⁻⁵ mol dm⁻³.

Calculate its pH.

Solutions of hydrochloric acid (HCl) and propanoic acid (CH₃CH₂COOH) each have a concentration of 0.10 mol dm⁻³.

Explain why the propanoic acid solution has a higher pH, and state one other experimental observation that would confirm it is the weaker acid. [3]