1.

lf 20 g of calcium carbonate is added to a solution containing 20 g of HCl. What substances will be present when the reaction is over and what quantity of each of them will be present there?

Answer»

Reaction:

CaCO3 + 2HCl → CaCl2 + CO2 + H2O

100g           73g

20g             20g

∵ 100 g CaCO3 require 73 g HCl

∴ 20 g CaCO3 require 73/100 x 20 = 14.6 g HCl

Thus, when the reaction is over 5.6 g of HCI present.



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