Question

1. A student wanted to make some zinc chloride crystals.
The student followed the procedure shown.
step 1 Add excess zinc powder to dilute hydrochloric acid to form aqueous zinc chloride.
step 2 Remove unreacted zinc powder from the aqueous zinc chloride.
step 3 Heat the solution until it is saturated.
step 4 Allow the saturated solution to cool and remove the crystals that form.
(a) Write the word equation for the reaction in step 1.
[2]
(b) Explain why excess zinc powder is added in step 1.
[1]
(c) Suggest how unreacted zinc powder is removed in step 2.
[1]
(d) Name two zinc compounds which react with dilute hydrochloric acid to form zinc chloride.
121

Answer 1

Answer:

step 1 Add excess zinc powder to dilute hydrochloric acid to form aqueous zinc chloride. step 2 Remove unreacted zinc powder from the aqueous zinc chloride. step 3 Heat the solution until it is saturated. step 4 Allow the saturated solution to cool and remove.

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Answer 2

Answer:

a) ZnO + 2HCl→ZnCl2 + H2O

b) This because zinc powder reacts easily with HCl thus more must be added

c) By Filtration

d)Zinc oxide

  Zinc carbonate

Explanation: