Acids react to produce salts - AQA - GCSE Chemistry Combined Science - Question 2 - 2021 - Paper 1
Question 2
Acids react to produce salts.
Universal indicator is added to water and then nitric acid is added to the mixture.
1. Give the colour change when nitric acid is add... show full transcript
Worked Solution & Example Answer:Acids react to produce salts - AQA - GCSE Chemistry Combined Science - Question 2 - 2021 - Paper 1
Step 1
1. Give the colour change when nitric acid is added to the mixture of universal indicator and water.
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Answer
The addition of nitric acid to the universal indicator in water results in a colour change from blue to red.
Step 2
2. What happens to the pH of water when nitric acid is added?
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Answer
When nitric acid is added to water, the pH decreases, indicating an increase in acidity.
Step 3
3. What is the state symbol for nitric acid?
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Answer
The state symbol for nitric acid is (aq), representing its aqueous solution.
Step 4
4. Give two observations that would be made when zinc carbonate is added to nitric acid until the zinc carbonate is in excess.
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Answer
The white solid zinc carbonate disappears as it reacts with nitric acid.
Fizzing and effervescence occur, indicating the release of carbon dioxide gas.
Step 5
5. What is the formula for zinc nitrate?
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The formula for zinc nitrate is Zn(NO₃)₂.
Step 6
6. Plan a method to produce a pure, dry sample of the soluble salt copper chloride from an acid and a metal oxide.
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Answer
React hydrochloric acid with copper oxide in a suitable container.
Warm the hydrochloric acid to enhance the reaction.
Add copper oxide to the acid until it is in excess.
Stir the mixture until solid remains.
Filter the excess copper oxide to obtain the solution containing copper chloride.
Pour the solution into an evaporating basin and use a water bath to evaporate some water gently, collecting the copper chloride salt as it crystallizes upon cooling.
