The `pH` of milk, black coffee, tomato juice, lemon juice and egg white are `6.8, 5.0, 4.2, 2.2` and `7.8` respectively. Calculate corresponding hydrogen ion concentration in each.

Explanation

(i)milk : -log `[H_3O^+]` =6.8
`[H_3O^+]=1.58xx10^(-7)`
(ii) black coffee : -log `[H_3O^+]`=5.0
`[H_3O^+]=1xx10^(-5)`
(iii) tomato juice : -log `[H_3O^+]` =4.2
`[H_3O^+]=6.31xx10^(-5)`
(iv)Lemon juice : -log `[H_3O^+]` =2.2
`[H_3O^+]=6.31xx10^(-3)` M
(v) egg white : -log `[H_3O^+]` =7.8
`[H_3O^+]=1.58xx10^(-8)`