Question

reasons why HCl gas is used for the fountain experiment

Answer 1

Answer:

Fountain experiment is used to demonstrate the solubility of the gas. ... The HCl gas present inside the flask dissolves in water due to its high solubility. It creates a low pressure inside the flask.

Explanation:

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Answer 2

The HCl gas present inside the flask dissolves in water due to its high solubility. It creates a low pressure inside the flask. But the pressure out side the flask being higher, pushes the blue litmus solution inside the flask with a great force and form a fountain.