Question

When an egg shell is reacted with dilute hydrochloric acid, foaming is observed and an effer-
vescent gas is produced. Once foaming subsides, a lighted agarbatti is extinguished on plac-
ing it inside test tube. Explain the following in the given activity:


(a) Procedure or steps followed in the activity


(b) Draw the picture of the experimental set-up


(c) Write the balanced chemical equation of the reaction taking place

Answer 1

(a). Step- 1. Take some chrushed​ egg shells and take 5ml of 20% of HCl in a testube.

Step- 2. Now put 2 grams of chrushed egg shells in the testube.

Step- 3. You will observe that a gas is coming out of the testube.

Step- 4. Now bring a lighted matchstick or an agarbatti, they will extinguish.

(c). As we know egg shells are made up of calcium carbonate, therefore the reaction will be-

CaCO3(s) + 2HCl(aq) ----› CaCl2(aq) + H2O (l) +
CO2(g)

I hope this will help you.