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)`

Options

A. `8.4 xx 10^(-4) M`
B. `4.2 xx 10^(-4) M`
C. `16.8 xx 10^(-4) M`
D. `12.0 xx 10^(-2) M`

Answer

D