Question.
Why does dry HCl gas not change the colour of the dry litmus paper ?
Why does dry HCl gas not change the colour of the dry litmus paper ?
solution:
Acid do not ionize in the absence of water to liberate $\mathrm{H}_{3} \mathrm{O}^{+}$which shows acidic nature of a solution.
Therefore, dry $\mathrm{HCl}$ gas does not change the colour of the dry litmus paper because it does not contain $\mathrm{H}^{+}$ions.
Acid do not ionize in the absence of water to liberate $\mathrm{H}_{3} \mathrm{O}^{+}$which shows acidic nature of a solution.
Therefore, dry $\mathrm{HCl}$ gas does not change the colour of the dry litmus paper because it does not contain $\mathrm{H}^{+}$ions.