Question

CuSO₄ .5H₂O, Na₂CO₃ .10H₂O, CaO and anhydrous calcium chloride are chemicals commonly available in laboratory. Answer the following questions relating your answer to the list of chemicals given above.

(i) Which salt is blue in colour ?

(ii) Which salt is efflorescent in nature ?

(iii) Which salt is hydroscopic in nature ?

(iv) Which salt is deliquescent in nature.

(v) State your observations when solution of calcium chloride is mixed with solution of sodium carbonate. 

Answer 1

(i) CuSO₄ . 5H₂O is blue in colour.

(ii) Na₂CO₃ .10H₂O is efflorescent in nature. 

(iii) CaO is hydroscopic in nature.

(iv) Anhydrous calcium chloride is deliquescent in nature.

(v) A white ppt. of calcium carbonate appears when the solutions of CaCl₂ and Na₂CO₃ are mixed. The white ppt. gradually settles at the base of test tube.