Chapter 2: Acids, Bases and Salts

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Acids,Bases, and Salts


Why does dry HCl gas not change the colour of the dry litmus paper?


When dry HCl gas is passed through dry litmus paper, it will show no change but when it is passed through the moist litmus paper, it will show colour change. This is because the hydrogen chloride gas release hydrogen ion only in presence of water. The release of hydrogen ion makes it acidic and it converts the blue litmus paper red.

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