In a practical investigation, a student adds powdered magnesium oxide to dilute sulfuric acid in a beaker and monitors the pH as the reaction proceeds.
The procedure is as follows:
Step 1: Measure 100 cm3 of dilute sulfuric acid into a beaker.
Step 2: Add 0.2 g of powdered magnesium oxide to the beaker.
Step 3: Measure and record the pH of the mixture.
Step 4: Repeat Steps 2 and 3 until there is no further change in pH.
State one action the student should take immediately after Step 2, before measuring the pH, to ensure that the reaction is complete.
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.