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Hoping someone can help me understand logarithm rules better when it comes to acid-base chemistry. I understand how to approximate pH, pOH, pKa and pKB given a concentration or a Ka/Kb. For example: [H3O+]= 8.89 x 10^(-4) so pH = 4-0.9, pH = 3.1 I don't understand how to do the reverse and approximate [H3O+] or [OH-] from a given pOH or pH. For example, how do I find [OH-] given a pH of 3.1? Or how would I find [H3O+] given a pH of 8.2?? Thanks so much for your help, this is really bugging me!