Question

why does dry hcl gas not change the colour of the dry litmus paper​

Answer 1

Answer:

As both the HCl and the litmus paper are dry, Dry HCl will change colour of wet litmus paper.

Answer 2

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 the aqueous form nor the litmus paper is wet, so the colour of the litmus paper does not change.

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