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Neutralization Reaction

In a tube con...

Question

In a tube containing 4 ml of sodium hydroxide two drops of phenolphthalein and then hydrochloric acid is added drop by drop. STATE THE KIND OF REACTION TAKING PLACE.

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Solution

Dear student ,

It is a neutralisation reaction.
NaOH + HCl $\to$ NaCl + H₂O

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Q. In order to study the neutralisation reaction of acid and base, a student took 10 mL of dilute hydrochloric acid in a conical flask and added a few drops of phenolphthalein indicator to it. He then added dilute sodium hydroxide solution to the conical flask dropwise with a dropper while shaking the conical flask constantly. When the acid is completely neutralised by the base, the solution in conical flask will turn :
(1) slightly red
(2) slightly yellow
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(4) slightly pink

Q. The indicator constant of phenolphthalein is approximately

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hydrochloric acid. If a few drops of phenolphthalein are now added, what fraction of the indicator is converted to its coloured form ?

Why does pink colour appear on gradually adding sodium hydroxide to a solution of acid having 2-3 drops of phenolphthalein?

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H^{+}

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