Question

In the activity 2NaCl(s)+H2SO4(aq))→2HCl(dry)+Na2SO4(aq) HCl(dry) does not change the dry litmus paper to red. What is reason to this ?​

Answer 1

Answer:

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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