Question

Does dry HCl gas turn blue litmus to red?

Answer 1

Dry hydrochloric acid (HCl) gas:

1. $\mathrm{HCl}$ (Hydrochloric Acid) gas does not produce ${\mathrm{H}}^{+}$ ions in its gaseous or dry state.
2. It has no acidic properties.
3. Dry HCl gas does not contain H⁺ ions.
4. It is only in the aqueous solution that an acid dissociates to give ions.

Reason to not turn blue litmus to red by dry HCl:

1. Since in this case, neither HCl is in the aqueous form nor the litmus paper is wet, therefore, the color of the litmus paper does not change.