Question

(b) How do metal carbonates and metal hydrogen carbonates react with acids? Give their
chemical equations.
(c) What is rock salt? Why is it brown in colour?​

Answer 1

Explanation:

All metal carbonates and hydrogen carbonates react with acids to form a corresponding salt, carbon dioxide and water.

Metal carbonate + Acid → Salt + Carbon dioxide + Water

Metal hydrogen carbonate + Acid → Salt + Carbon dioxide + Water

For example, sodium carbonate reacts with dilute hydrochloric acid as follows:

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

Sodium hydrogen carbonate reacts with dilute hydrochloric acid as follows:

NaHCO3(s)+HCl(aq)→NaCl(aq)+H2O(l)+CO2(g)

Answer 2

All metal carbonates and hydrogen carbonates react with acids to form a corresponding salt, carbon dioxide and water.

Metal carbonate + Acid → Salt + Carbon dioxide + Water

Metal hydrogen carbonate + Acid → Salt + Carbon dioxide + Water

For example, sodium carbonate reacts with dilute hydrochloric acid as follows:

Na2CO 3

(s)+2HCl(aq)→2NaCl(aq)+H 2O+CO 2

(g)

Sodium hydrogen carbonate reacts with dilute hydrochloric acid as follows:

NaHCO 3

(s)+HCl(aq)→NaCl(aq)+H 2O(l)+CO 2 (g)

B)Rock salt tends to be the industrial name used for Halite. When very hot temperatures in the area evaporated the waters very slowly they left large salt deposits under the earth. As the water evaporated and the salt crystals started to form they got their brownish colour from sand blown in from eastern deserts.