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 × 10-4 mol L-1

Moderate

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a

8.4 × 10-4 M

b

4.2 × 10-4 M

c

16.8 × 10-4 M

d

11.9 × 10-2 M

answer is D.

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Detailed Solution

H+ = KaC, pH=2, ∴ H+ = 10-2 M10-2 = KaC10-4 = 8.4 × 10-4 × C ∴ C = 11.9 × 10-2 M

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