In an investigation into the neutralisation of acids, a student added solid magnesium oxide, MgO\text{MgO}MgO, in 0.15 g portions to a beaker containing 60 cm3 of dilute nitric acid, HNO3\text{HNO}_3HNO3.
Explain why the mixture was stirred thoroughly after each addition of magnesium oxide before the pH was measured.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.