5 (a) Zinc carbonate powder is added to dilute hydrochloric acid in a beaker - Edexcel - GCSE Chemistry - Question 5 - 2017 - Paper 1
Question 5
5 (a) Zinc carbonate powder is added to dilute hydrochloric acid in a beaker.
A gas is given off: the gas turns limewater milky.
Zinc carbonate is added until some i... show full transcript
Worked Solution & Example Answer:5 (a) Zinc carbonate powder is added to dilute hydrochloric acid in a beaker - Edexcel - GCSE Chemistry - Question 5 - 2017 - Paper 1
Step 1
Explain how pure zinc chloride solution is obtained from this mixture.
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Answer
To obtain pure zinc chloride solution from the mixture, filtration is carried out.
First, the mixture of zinc chloride solution and excess solid zinc carbonate is poured through a filter paper placed in a funnel. This allows the liquid portion containing the dissolved zinc chloride to pass through while the solid zinc carbonate is retained on the filter paper.
The clear filtrate collected in a suitable container, such as a conical flask, contains the pure zinc chloride solution. This process effectively separates the solid impurities from the liquid solution.
Step 2
Complete the equation for this reaction by adding the formula of the gas given off and then balancing the equation.
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Answer
The gas given off during the reaction is carbon dioxide, which can be represented as CO₂. Therefore, the completed and balanced chemical equation is:
ZnCO3+2HCl→ZnCl2+H2O+CO2
Step 3
Suggest the name of a suitable indicator and state the colour change.
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Answer
A suitable indicator to use in this experiment is litmus.
