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# Presentation of chlorhydric acid

## Dissolution of hydrogen chloride in water

Water colored by the indicator methylorange squirts into the flask filled with hydrogen chloride gas (a colourless gas with a pungent odour). While it dissolves in water, $HCl$ leaves a vacuum which is replaced by the water fountain. The methylorange turns to red, an acid has formed.

The solution of hydrogen chloride gas in water is called chlorhydric acid

## Physical properties

Chlorhydric acid is a colourless liquid, highly corrosive and with a pungent odour