A student was asked to test an unknown colourless solution with an indicator. When he added a few drops of phenophthalein indicator, the solution turned pink. Which one of the following chemicals should be added in excess so as to obtain the colourless solution again?
(1) HCI solution (2) NaOH solution (3) NH3 solution (4) NaCI solution
Answers
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Explanation:
first we have to know that how phenolphtalein changes the colour
phenolphthalein+acid= no colour
"+base= pink colour
your ans is b NaoH as it is abase
Answered by
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(a) HCl (Hydrochloric acid) solution is added in excess so as to obtain the colourless solution.
Explanation:
- According to the question, the colourless solution should either be acidic or neutral. By adding a few drops of phenolphthalein indicator, the solution is turning pink, which shows that the solution is a base.
- The pink colour of the solution will vanish, and the solution will become colourless only when an acid is added. Among the options given above, HCl is the acid. So, HCl is the answer.
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