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Q.

A student added a blue litmus solution to a colourless aqueous solution. The solution turned red. Which one of the following chemicals should be added in excess so that the change in colour is reversed?


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a

Ethanol solution

b

Caustic soda solution

c

HCl solution

d

Vinegar solution. 

answer is B.

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Detailed Solution

Caustic soda solution should be added in excess so that change in colour is reversed.     When a blue litmus paper turns red it means that it was added to an acidic solution which changed the colour to red. Now, to reverse the colour a base needs to be added such that the red colour will now be changed to a blue colour. Out of the options given, only caustic soda (NaOH) is a base and can be used to reverse the colour.
 
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