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Question
The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3 M. what is its pH?
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Solution
Given
`["H"^(+)] = 3.8 xx 10^(-3) "M"`
∴ pH value of soft drink
`= - log["H"^(+)]`
`= - log(3.8 xx 10^(-3))`
`= - log 3.8 - log 10^(-3)`
= - log 3.8 + 3
= - 0.58 + 3
= 2.42
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