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Acids

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Question 161

An environmental chemist is investigating how the pH of acidic industrial runoff changes during a treatment process.

The chemist used the following method:

  • Step 1: Measure 50 cm3 of the acidic runoff (containing dilute sulfuric acid) into a beaker using a measuring cylinder.
  • Step 2: Use a clean glass rod to transfer a single drop of the runoff onto a piece of universal indicator paper and record the pH.
  • Step 3: Add 0.2 g of magnesium oxide powder to the beaker and stir thoroughly.
  • Step 4: Use the glass rod to transfer a drop of the resulting 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.

State the name of an instrument that could be used to measure the pH of the mixture in Step 4 with greater precision 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