Question

Why dry HCL does not change the colour of litmus paper​

Answer 1

Answer:

due to absence of ions .

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Answer 2

Acids dissociate to give H+ ions only in aqueous solution. Strong acids disassociate completely to H+ ions that's why we moist the litmus paper and take aqueous solution. If litmus or HCL is dry it will not disassociate and hence the color of the litmus will not change.