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

`" " [H^(+) ] = [H_3O^(+) ]`
` therefore [H_3O^(+) ] ` in milk = ` antilog_(10) (-5.0) `
`[H_3O^(+) ] ` in tomato juice `= " antilog"_(10) (-4.2) `
`" " = 6.31 xx 10^(-5) " mol " L^(-1)`
` [H_3O^(+) ]` in lemon juice `= " antilog"_(10) (-2.2) `
` " " = 6.31 xx 10 ^(-3) " mol " L^(-1)`
` " " [H_3O^(+) ] ` in egg `= " antilog"_(10) (-7.8 ) `
` " " = 1.58xx 10 ^(-8) " mol " L^(-1)`