Why does dry HCL gas does not change the colour of dry blue litmus Paper?
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dry HCL gas not change the colour of the dry litmus paper ... To change the colour of blue litmus paper to red, there must be a presence of acid. Dry HCl gas is not acidic because water is required for the dissociation of HCl into H+ and Cl-. Therefore, dry HCl gas is not acidic and will not change the colour of dry blue litmus paper.
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