Question

The pH of a solution is measured as 4.5. What is the hydrogen ion concentration of the solution? A. 4.0 × 10-5 M B. 3.2 × 10-5 M C. 4.5 M D. 3.2 × 104 M

Answer 1

10-7mol/L






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Answer 2

Answer : The hydrogen ion concentration is, (B)
`3.2* 10^(-5)M`

Explanation :

pH : It is defined as the negative logarithm of hydrogen ion concentration.

`pH=-\log [H^+]`

Given:

pH = 4.5

Now put the value of pH in the above expression, we get value of hydrogen ion concentration.

`pH=-\log [H^+]`

`4.5=-\log [H^+]`

`[H^+]=3.2* 10^(-5)M`

Thus, the hydrogen ion concentration is,
`3.2* 10^(-5)M`