Why does dry litmus paper not show colour change with solution of dry HCL in dry toluene
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Acids show acidic behavior only when water is added to it. When water is mixed with acids, they(acids) release H+ ions to show acidic properties. Hence, dry litmus paper do not show colour change with solution of dry HCl
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We know that the colour of litmus paper is changed by H + ions because of acid.
Dry HCL it does not dissociate to give H+ ions.
Acids dissociate to give ions only in the aqueous solution.
In this HCL is not in aqueous form nor litmus paper is wet, so the colour of litmus paper does not change.
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