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The correct answer is 1.778 x 10^-11M. Hope this helps.

The concentration of hydroxyl group  by using pOH is [tex]10^{10.75}[/tex].

What is pOH?

The pOH of water would be a measurement about how acidic or basic it is. The scale runs from 0 to 14, having 7 being neutral.

Calculation of concentration of OH- by using pOH.

It can be calculated by using the formula.

pH + pOH = 14

and, pOH = -log [OH-]

Converting , above equation.

OH- = [tex]10^{-pOH}[/tex]

Put the value of pOH in above expression.

OH- = [tex]10^{10.75}[/tex]

Therefore, the concentration of OH- will be [tex]10^{10.75}[/tex].

To know more about pOH .

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