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Acids

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Question 42

A student investigates the reaction between calcium and cold water. They want to demonstrate that the reaction produces both hydrogen gas and an alkaline solution.

They write down the following steps for their qualitative tests:

  • Step 3: Test the gas collected at the top of the test tube by inserting a glowing wooden splint.
  • Step 4: Test the solution remaining in the beaker by dipping a piece of blue litmus paper into it.

Explain one change that should be made to Step 3 and one change that should be made to Step 4 so that the student can successfully identify both products.

[3]

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