(a) Write a balanced equation for the reaction of zinc and dilute hydrochloric acid.
(b) State what is observed when hydrochloric acid is added to silver nitrate solution.

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Solution

(a) The reaction between zinc and hydrochloric acid leads to the formation of zinc chloride, as shown below:

Zn(s) + 2HCl(aq) → ZnCl₂(aq)+ H₂(g)
Zinc chloride

(b) When dilute hydrochloric acid is treated with silver nitrate solution, a curdy white precipitate of silver chloride is formed.

HCl(aq) + AgNO₃(aq) → AgCl(s) + HNO₃(aq)
(White ppt.)

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