In an acid-base titration, 25.0 cm³ of hydrochloric acid (HCl) is titrated with 0.100 mol/dm³ sodium hydroxide (NaOH). How many moles of NaOH are required to completely neutralize the acid?

0.00250 mol. This answer is anchored to A-level required practical activities.

0.00250 mol is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 9: investigate pH changes in acid-base titrations. This reasoning is anchored to A-level required practical activities in A-level practical endorsement and required practical activities, and it separates titration from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.