This question is about acids and their reactions.
Acids can be either weak or strong.
What is meant by 'a weak acid'?

Acids are substances that release hydrogen ions (H⁺) when dissolved in water. The strength of an acid depends on the extent to which it ionises (or dissociates) to release these H⁺ ions. - A **strong acid** (e.g., HCl) fully ionises in aqueous solution. All the acid molecules break apart to release their H⁺ ions. (e.g., HCl → H⁺ + Cl⁻) - A **weak acid** (e.g., ethanoic acid, CH₃COOH) only partially ionises in aqueous solution. Only a small fraction of the acid molecules break apart to release H⁺ ions. The reaction is reversible. (e.g., CH₃COOH ⇌ H⁺ + CH₃COO⁻)