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 when nitric acid is added to the mixture.
Step 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 of the solution decreases due to the increase in hydrogen ion concentration.
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) disappears, indicating that it has reacted.
Fizzing or bubbling is observed due to the release of carbon dioxide gas.
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
To produce a pure, dry sample of copper chloride:
React hydrochloric acid with copper oxide in a suitable container.
Warm the hydrochloric acid before adding copper oxide until in excess, or until the solid remains.
Stir the mixture, then filter to remove excess copper oxide.
Pour the solution into an evaporating basin.
Use a water bath to gently heat and partially evaporate the solution.
