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Lemon juice normally has a pH of 2. If a...

Lemon juice normally has a `pH` of `2`. If all the acid 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)
`HCithArrH^(+)+Cit^(-)`, `K_(a)=8.4xx10^(-4) mol L^(-1)`

A

`8.4xx10^(-4) M`

B

`4.2xx10^(-4) M`

C

`16.8xx10^(-4) M`

D

`11.9xx10^(-2) M`

Text Solution

Verified by Experts

The correct Answer is:
D
`[H^(+)]=sqrt(K_(a)C), pH=2, :. [H^(+)]=10^(-2) M`
`10^(-2)=sqrt(K_(a)C)`
`10^(-4)=8.4xx10^(-4)xxC`
`:. C=11.9xx10^(-2) M`
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A2Z-IONIC EQUILIBIUM-Section D - Chapter End Test
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  16. The pH of 0.1 M solution of the following salts increases in the order

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  17. In the equilibrium A^(-)+H(2)OhArrHA+OH^(-)(K(a)=1.0xx10^(-5)). The de...

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  18. The sulphide ion concentration [S^(2-)] in saturated H(2)S solution is...

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  19. The K(sp) of CuS, Ag(2)S and HgS are 10^(-31), 10^(-44) and 10^(-54) r...

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