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