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Q.

An indicator is a weak acid and pH range of its colour is 3 to 5. If the neutral points of the indicator lies in the centre of the hydrogen ion concentration comesponding to given pH range then pH at the equivalence point is

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a

3.3

b

4.0

c

7.0

d

5.0

answer is A.

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Detailed Solution

pH range is 3 to 5.  ∴ H+between 10−3 to 10−5.  H+ at the equivalence point =10−3+10−52 =5.05×10−4M pH = 3.3
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