The number of `H^(+)` ions present in 250 ml of lemon juice of pH=3 is

Options

A. `1.506 xx 10^(22)`
B. `1.506 xx 10^(23)`
C. `1.506 xx 10^(20)`
D. `3.012 xx 10^(21)`

Answer

C

Explanation

`[H^(+)] = 10^(-pH) = 10^(-3)`
No. of moles of `H^(+)` ion in 250 mL = `0.25 xx 10^(-3)`
No. of `[H^(+)] ` ions in 250 mL = `6.022 xx 10^(23) xx 0.25 xx 10^(-3)`
`= 1.506 xx 10^(20)`