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 ... 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, the following steps should be taken:
Filtration: The mixture is filtered using filter paper. This allows the solid zinc carbonate to remain on the filter paper while the zinc chloride solution passes through into the receiving container.
Result: The filtrate collected will be the zinc chloride solution, while the excess solid zinc carbonate will be left on the filter paper.
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 balanced chemical equation for the reaction is:
ZnCO3+2HCl→ZnCl2+H2O+CO2
This includes the correct formulas for all reactants and products.
Step 3
Suggest the name of a suitable indicator and state the colour change.
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Answer
A suitable acid-base indicator for this experiment is litmus.
Colour change: The colour changes from red (in acidic solution) to blue (in alkaline solution).
