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This question is about reactions of ethanoic acid and the analysis of salts - AQA - GCSE Chemistry - Question 1 - 2016 - Paper 3
Question 1
This question is about reactions of ethanoic acid and the analysis of salts. 1 (a) Figure 1 shows the apparatus used to investigate the reaction of ethanoic acid wi... show full transcript
Worked Solution & Example Answer:This question is about reactions of ethanoic acid and the analysis of salts - AQA - GCSE Chemistry - Question 1 - 2016 - Paper 3
Step 1
1 (a) (i) Describe a change that would be seen in each test tube.
Answer
In Test tube 1, you would observe effervescence or fizzing due to carbon dioxide gas being released from the reaction between ethanoic acid and calcium carbonate. The limewater in Test tube 2 would turn cloudy because the carbon dioxide produced reacts with limewater to form calcium carbonate, which is a precipitate. This explains the observed changes.
Step 2
Step 3
Step 4
1 (b) Complete the table of results.
Answer
| Potassium chloride solution | Calcium nitrate solution | Ammonium sulfate solution | Water | |
|---|---|---|---|---|
| Test with silver nitrate in the presence of dilute nitric acid | no change | no change | no change | no change |
| Test with barium chloride in the presence of dilute hydrochloric acid | no change | white precipitate | no change | no change |
Step 5
Step 6
1 (c) (ii) Give one reason why a flame test would not show the presence of both potassium and calcium ions in a mixture.
Answer
A flame test would not show the presence of both potassium and calcium ions in a mixture because the colours can mask or change each other, making it difficult to distinguish between the two.