J.R. S. answered 03/24/22
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CsOH ==> Cs+ + OH-
2.5x10-4 ->2.5x10-4 M Cs+ + 2.5x10-4 M OH-
pOH = -log [OH-] = 3.60
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 3.60
pH = 10.4