Hydroxide ion concentration pH of Solution?

This seems like an impossible low [OH-} In fact I would say an impossibly low concentration: The acid concentration must be extremely high. Impossibly high!! But let us persevere:

pOH = -log [OH-]

pOH = -log (1*10^-23)

pOH = 23

pH = 14.00-pOH

pH = 14.00-23.00

pH = -9.00

Is it possible to have a negative pH = yes, if the [H+] > 1.00. But a pH of -9.00 would require [H+]:

[H+] = 10^-pH

[H+] = 10^-(-9)

[H+] = 10^9M

It is not possible to get such an acid solution. Please check you submission for possible error.

Since you need to find the pOH using:

pOH= -log [OH-]

You can't do this calculation, since pOH will be within 0-14. In your case:

pOH= -log 1x10^-23

=23

The pOH cannot be 23, becuase when you use this to find pH you get:

pH= 14- pOH

=14-23

=-9

You can't get -9 pH, sorry :)