Why is hydrogen gas collected
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Hydrogen is collected by downward displacement of water as it is less denser than water. Hence it comes out at the surface of water . It is insoluble in water so it does not dissolve in water. In case of displacement with air, it is not possible even if hydrogen is lighter than air (14.5 times lighter than air).
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Sometimes gases are collected over water. The gas produced in a reaction is bubbled through a trough of water and into an upturned gas jar filled with water. This works well for insoluble gases such as hydrogen that do not dissolve easily in water, such as carbon dioxide and oxygen. Gases are collected over water Because displacement of water is a convenient means to collect a gas.......
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