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The pH of milk, black coffee, tomato jui...

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.

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The correct Answer is:
`1.5xx10^(-7) M, 10^(-5) M, 6.31xx10^(-5) M, 6.31xx10^(-3) M`
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