A student makes copper sulfate crystals. They add copper oxide powder to warm dilute sulfuric acid until no more copper oxide dissolves.
Why does the student add copper oxide until no more dissolves?
To make the reaction with the acid faster
To make sure all of the acid is neutralised
To make sure the solution stays acidic
To make the copper sulfate crystals larger
53 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.