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Q.

Which of the following indicators can be used to detect end point in the titration of a weak acid versus strong base?

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a

Methyl red (4.2 to 6.3)

b

Methyl orange (3 .1 to 4.4)

c

Thymolphthalein (9.3 to 10.5)

d

Methyl violet (0.1 to 3.2)

answer is D.

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Detailed Solution

In the titration of a weak acid (say, acetic acid) versus strong base (say, sodium hydroxide), the pH at the equivalence point is more that 7 due to hydrolysis of congugate base of the weak acid. The steep rise in pH around equivalence point encompasses the range 7 to 10. Thus, thymolphthalein can be used as the indicator to locate end point.

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