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Acids

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Question 169

A student investigated how the pH of a mixture changed as calcium hydroxide powder was added to dilute nitric acid.

The student used the following method.

  • Step 1: Measure 25 cm3 of dilute nitric acid into a beaker using a measuring cylinder.
  • Step 2: Use a clean glass rod to transfer a drop of the acid onto a piece of universal indicator paper and record the pH.
  • Step 3: Add 0.5 g of calcium hydroxide to the acid in the beaker and stir thoroughly.
  • Step 4: Use the glass rod to transfer a drop of the mixture onto a fresh piece of universal indicator paper and record the pH.
  • Step 5: Repeat steps 3 and 4 until the recorded pH no longer changes.

Name a piece of equipment that could be used to measure the pH of the mixture more accurately than universal indicator paper.

[1]

Acids Questions

  1. GCSE
  2. /Chemistry
  3. /Acids

Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 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.

Question bank