1.

1. Some compounds of sodium and calcium are given below. Match them.           A            B(i) Washing soda(ii) Baking soda(iii) Gypsum(iv) Plaster of Paris1. CaSO4.1/2H2O2. Na2CO33.NaHCO34. CaSO4.2H2O2. On passing CO2 through lime water, milkiness appears. On further passing CO2 milkiness disappears. What is the Chemistry behind it?

Answer»

1. 

          A            B
(i) Washing soda
(ii) Baking soda
(iii) Gypsum
(iv) Plaster of Paris
1. Na2CO3
2. NaHCO3
3. CaSO4.2H2O
4. CaSO4.1/2H2O


2. When CO2 is passed through lime water it turns milky due to the formation of insoluble calcium carbonate. 

Ca(OH)2 + CO2 → CaCO3 + H2

When CO2 is passed through lime water for a long time, it becomes colourless due to the formation of water soluble calcium bicarbonate. 

CaCO3 + H2O + CO2 → CaO(HCO3)2



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