Question

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

Answer 1

Answer:

pH = 5.9

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:

$[H^{+} ]=\frac{1.0*10^{-14} }{[OH^{-}] }$

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

$[H^{+} ]=\frac{1.0*10^{-14} }{7.1*10^{-9} }$

[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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