Why does dry HCl gas de not change the
colour of dry litmus paper.
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Explanation:
We know that the colour of litmus paper is changed by H + ions because of acid. Dry HCL it does not dissociate to give H+ ions. Acids dissociate to give ions only in the aqueous solution. In this HCL is not in aqueous form nor litmus paper is wet, so the colour of litmus paper does not change.
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ANSWER :
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HCl is acidic only when it is dry or moist. Only during that condition, it can change the color of blue litmus into red .
Dry HCl is not acidic .
So it cannot change the color of blue litmus .
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