Question

A solution has a pOH of 8.20. What is the concentration of H3O+?

A. 6.3 × 10-9
B. 1.6 × 10-6
C. 2.0 × 10-6
D. 10.2 × 108

Answer 1

The answer is B.1.6*10-6

Step-by-step explanation:

100%correct

Answer 2

The correct answer is B.
`1.6* 10^(-6)`

Explanation

The question provides us with information about the concentration of
`[OH^(-) ]` and we are supposed to use this information to find the
`[H^(+) ]` concentration. The pH of a solution gives us information about
`[H^(+) ]`

If we the reaction is in equilibrium and with standard conditions of 25°C, then pH is given by the formula

`14 = pH + pOH\\\implies pH= 14 - pOH= 14-8.20= 5.8`.

Once we find the pH we use the relationship
`pH= -log[H^(+) ]`, then the
`[H^(+) ]`,is given by

`pH = -log[H^(+) ]\\\implies [H^(+) ]= 10^(-pH) = 10^(-5.8)= 1.58 * 10^(-6)`