Hold one moist and one dry strip of blue litmus paper over dry HCl acid gas. Which strip will turn red and why?

The moist litmus paper will turn red, because:
  •  Litmus paper turns red when it detects the H+ ion of an acidic substance.
  • The gaseous HCl doesn't dissociate into H+ and Cl- ions in dry conditions.
  • When gaseous HCl gets in contact with water present in the moist litmus paper, HCl is ionized into H+ and Cl- ions and turns blue litmus to red.


Simply Easy Learning

Updated on: 10-Oct-2022


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