(1) the composition of soda lime is a mixture of calcium oxide and sodium hydroxide, in which the calcium oxide can react with water chemically, sodium hydroxide has a water-absorbent, so it is commonly used as a desiccant, so the answer to this question is: Calcium oxide can react with water, sodium hydroxide has a water-absorbent;

(2) a certain gas (2) the aqueous solution of a gas PH <5, indicating that the gas is acidic, and soda lime is alkaline, and the gas can be chemical reaction with the aqueous solution, so can not use soda lime drying, so the answer to this question is: can not.

The aqueous solution can react with soda lime.