Question

Study the properties of hydrochloric acid by their reaction with: (a) red and blue litmus solution (b) zinc metal (c) solid sodium carbonate

Answer 1

Answer:

a) HCl when reacted with red litmus paper, don't results to any change but when reacted with blue litmus, the blue colour of litmus changes to red.

b) HCl when reacted with Zn metal, forms ZnCl2 and liberates hydrogen gas.

c) HCl when reacted with sodium carbonate then, NaCl is formed with water and liberation of CO2 gas takes place.

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Answer 2

The properties of hydrochloric acid by the given reactions are as follows:

(a) Upon reaction with red litmus solution, HCl does not changes its colour but when HCl is reacted with blue litmus solution, then the blue colour of litmus changes to red.

- This observation shows that HCl is an acid.

(b) Upon reacting with zinc metal, HCl forms ZnCl2 and liberates hydrogen gas.

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

- This reaction shows that oxidation of zinc is taking place due to HCl.

- Further, it also shows that HCl is a strong acid.

(c) Upon reacting with sodium carbonate, HCl forms NaCl, water and liberation of CO2 gas takes place.

Na2CO3 (s) + 2 HCl (aq) → 2 NaCl (s) + CO2 (g) + H2O (l)

- This reaction further confirms that HCl is a strong acid as Na2CO3 is a base and their reaction forms a salt NaCl.