Question

What is the pH of a solution with a [OH-] of 7.1 x 10-9?
W

Answer 1

pH = 5.9

Step-by-step explanation:

The equation to find pH is as follows:

pH = -log[H+]

We are not given [H+] so we have to find it given the value of [OH-].

To find [H+] from [OH-], use this equation:

`[H^(+) ]=(1.0*10^(-14) )/([OH^(-)] )`

Plug in [OH-] and solve for [H+]:

`[H^(+) ]=(1.0*10^(-14) )/(7.1*10^(-9) )`

[H+] =
`1.41 * 10^(-6)`

Now that we have found [H+] plug it into the pH equation and solve:

`pH =-log(1.41*10^(-6) )`

pH = 5.9

So, the pH of the solution would be 5.9

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