Hydrogen may be prepared in the laboratory by the action of a metal on an acid. How would you modify your apparatus in to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

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Solution

Hydrogen can be made by reaction of any active metal like $M g$ or $Z n$ with a strong acid sulfuric acid or hydrochloric acid. since hydrogen gas is almost insoluble in water it can be collected by displacement of water using an inverted bottle. The collected hydrogen will be saturated with water vapor and contaminated with small amount of air. the gas can be forced to move through calcium chloride pellets to remove water as drying agent.

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