1. For each of the following pairs of solid samples, suggest a test to distinguish between them. State your expected observations in each case.
a) Calcium carbonate and calcium hydrogencarbonate
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2008-09-21 1:22 am
回答 (2)
2008-09-21 5:53 am
✔ 最佳答案
1a) We can use magnesium sulphate solution（MgSO4 (aq)）to distinguish them:
Chemical equation:
Mg2+ (aq) + CO3 2- (s) → MgCO3 (s)
white precipitate
Mg2+ (aq) + 2HCO3 - (aq) → Mg(HCO3)2 (aq)
colourless solution
Since calcium carbonate will form white precipitate with adding magnesium sulphate solution, while calcium hydrogencarbonate will not change in observation after adding magnesium sulphate solution.
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2008-09-21 2:52 am
Add AgCl into them respectively. The one which produce white powder is CaCO3 and the one have no reaction is Ca(HCO3)2.
收錄日期: 2021-04-13 16:45:18
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