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Q.

An indicator is a weak acid and pH range of its colour is 3 to 5. If the neutral point of the indicator lies in the centre of the H+ corresponding to given pH range, then pH at the equivalence point is

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a

7.0

b

4.0

c

3.3

d

5.0

answer is C.

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Detailed Solution

The neutral point is at the centre of the H+ ion concentration H+ at pH=3  is 10-3 H+ at pH=5  is 10-5 Thus, H+ at the centre = 10-3+ 10-52 =  101 × 10-52 ∴  pH = - log   101 × 10-52 = 3.3
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