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Verified answer
POH = 14 - 9,7 = 4,3pOH = -log [OH-]
4,3 = - log [OH-]
4,3 = - log [OH-]
4 + log 2 = - log [OH-]
4 = - (log [OH-] + log 2)
-4 = log ( [OH-] .2)
[OH-] . 2 = 10^-4
[OH-] = 1/2. 10^-4M
[OH-] = 0,5. 10^-4M
[OH-] = 5. 10^-5M