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 adde... show full transcript
Worked Solution & Example Answer:Acids react to produce salts - AQA - GCSE Chemistry Combined Science - Question 2 - 2021 - Paper 1
Step 1
Give the colour change when nitric acid is added to the mixture of universal indicator and water.
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Answer
The universal indicator will change from blue to red, indicating the presence of an acid.
Step 2
What happens to the pH of water when nitric acid is added?
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Answer
The pH of water decreases when nitric acid is added, as nitric acid is a strong acid.
Step 3
What is the state symbol for nitric acid?
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Answer
The state symbol for nitric acid is (aq), indicating that it is in aqueous solution.
Step 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 will disappear as it reacts with nitric acid.
Bubbles of gas (carbon dioxide) will be observed during the reaction.
Step 5
What is the formula for zinc nitrate?
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The formula for zinc nitrate is Zn(NO₃)₂.
Step 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 increase the rate of reaction.
Add copper oxide until in excess to ensure complete reaction.
Stir the mixture to allow all the copper oxide to react.
Filter to remove excess copper oxide.
Pour the filtrate into an evaporating basin and heat gently to partially evaporate the solution.
Leave to cool and crystallize the copper chloride.
