Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
Why does dry $HCl$ gas not change the colour of the dry litmus paper ?
Colour of the litmus paper is changed by the hydrogen ions. Dry $HCl$ gas does not contain $H ^{+}$ ions. It is only in the aqueous solution that an acid dissociates to give ions.
since in this case, neither $HCl$ is in the aqueous form nor the litmus paper is wet, therefore, the colour of the litmus paper does not change.
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