A student wanted to investigate how the pH of the mixture changes as calcium hydroxide is added to dilute sulfuric acid.
They followed this method.
Step 1 Measure out 25.0 cm3 of dilute sulfuric acid into a beaker using a measuring cylinder.
Step 2 Use a glass rod to place a drop of the acid onto a piece of universal indicator paper and record the pH.
Step 3 Add 0.1 g of calcium hydroxide to the acid in the beaker and stir.
Step 4 Use the glass rod to place a drop of the mixture onto a new piece of universal indicator paper and record the pH again.
Step 5 Repeat steps 3–4 until there is no further change in the pH.
Name a piece of equipment which could be used to measure out 25.0 cm3 of dilute sulfuric acid more accurately than the measuring cylinder.
276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.