Question

57. What happens when excess of Co, is passed through lime water?
58. Why calcium hydroxide is used in white washing?​

Answer 1

1)What happens when excess of Co, is passed through lime water?

Answer :

When CO2 is passed through lime-water, it turns milky due to the formation of an insoluble precipitate of Calcium Carbonate. ... The CaCO3 precipitate causes the milkiness. If you pass excess CO2 through lime-water, the CaCO3 reacts with the excess CO2 and water to form calcium hydrogen carbonate or calcium bicarbonate.

2) Why calcium hydroxide is used in white washing?

Answer :

Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.

Answer 2

Answer:

57)Can(OH)2+CO2=CaCo3 (s) white precipitate)+H20...it may be help you