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

•  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.
  

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Updated on: 10-Oct-2022

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