Allied solutions

Allied solutions

Grade 8

Carbon and its compounds | Exercise

Question 11

Q11) In the laboratory preparation of carbon dioxide by action of a dilute acid on a metallic carbonate give - (a) A balanced equation for the preparation (b) A reason for (i) use of a washer bottle containing concentrated H_2SO_4 in the preparation (ii) Not collecting the prepared gas over water (iii) Not using dilute sulphuric acid as a reactant in the preparation.

Solution:

(a) CaCO_3+2HCl\ →\ CaCl_2+CO_2+H_2O

(b)

(i) Concentrated H_2SO_4 absorbs moisture from the gas in the washer bottle.

(ii) The prepared gas is CO2 which does not collect over water because it is soluble in water.

(iii) Dilute sulphuric acid when used as a reactant with calcium carbonate forms a coating of insoluble calcium sulphate and the reaction stops after a while. CaCO_3+H_2SO_4\ →\ CaSO_4+CO_2+H_2O

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Question 11

Q11) In the laboratory preparation of carbon dioxide by action of a dilute acid on a metallic carbonate give - (a) A balanced equation for the preparation (b) A reason for (i) use of a washer bottle containing concentrated H_2SO_4 in the preparation (ii) Not collecting the prepared gas over water (iii) Not using dilute sulphuric acid as a reactant in the preparation.

Solution:

(a) CaCO_3+2HCl\ →\ CaCl_2+CO_2+H_2O

(b)

(i) Concentrated H_2SO_4 absorbs moisture from the gas in the washer bottle.

(ii) The prepared gas is CO2 which does not collect over water because it is soluble in water.

(iii) Dilute sulphuric acid when used as a reactant with calcium carbonate forms a coating of insoluble calcium sulphate and the reaction stops after a while. CaCO_3+H_2SO_4\ →\ CaSO_4+CO_2+H_2O

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