Testing for carbonates (CO3^2-)

2 marks · Normal

Complete these sentences about the test for carbonate ions. (1) When dilute acid is added to a carbonate compound, __________ is given off. (2) This gas can be tested using __________.

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((1)) carbon dioxide

((2)) limewater

Also accept: CO2 for carbon dioxide; lime water for limewater

Common mistakes: writing oxygen or hydrogen

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Marking points

B1 · 1 mark · Correct completion: ‘carbon dioxide’ (accept ‘CO2’).

B1 · 1 mark · Correct completion: ‘limewater’ (accept ‘lime water’).

Worked solution

(1) carbon dioxide (2) limewater