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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? |
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Answer» 1.
Ca(OH)2 + CO2 → CaCO3 + H2O 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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