Question

If a wet blue litmus paper is brought near to HCl gas what change will u observe and why?

Answer 1

If wet blue litmus paper is brought near HCL  gas then it will turn red as HCL forms hydronium ions in water

Answer 2

When wet blue litmus paper is brought near to HCl gas, it will turn red.

Explanation:

• In normal cases when blue litmus paper is treated with acid, it changes its color to red indicating the acidity of the substance.
• In the case of HCl, it is slightly different. HCl is considered to be acidic when it is in moist or aqueous form.  
• Thus to find the acidity of HCl, either the acid must be moist or the litmus paper which is used for the testing must be moist.
• The main principle behind the interaction of HCl on litmus paper is that the hydrogen chloride gas present in HCl reacts with water present in the litmus paper and turns it red.
• Thus it is inferred that the wet strip of blue litmus paper over dry HCl acid gas will turn red.

Learn more about such concept

A gas formed when sodium chloride is heated with concentrated sulfuric acid turns moist blue litmus red

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Why for testing dry hydrochloric acid moist Litmus Paper is used?or why for testing dry hydrochloric acid dry Litmus Paper is not used ?

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