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Q.

Lemon juice normally has a pH of 2. If all the acid in the lemon juice is citric acid and there are no citrate salts present, then what will be the citric acid concentration[HCit] in the lemon juice? (Assume that only the first hydrogen of citric acid is important)HCit⇌H++Cit−,Ka=8.4×10−4molL−1

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a

8.4×10−4M

b

4.2×10−4M

c

16.8×10−4M

d

12.0×10−2M

answer is D.

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Detailed Solution

H+=KaC, pH=2 ∴ H+=10−2M 10−2−KaC 10−4=8.4×10−4×C ∴ C=11.9×10−2

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