Originally Posted by Kirk Keyes [Re: KOH pH...] here's the way to calculate it. A 3% solution is about 0.53M KOH. Calculate pOH first: pOH = -log10[OH-] Kirk, How can I Calculate -log10 [whatever] on line? I no longer have a scientific calculator... Thanks Ray --------- ps, Sorry for the location of ths post... it should be in part 2 very confused... sorry ...