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FORGET UNBF
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they cant prove its you, plenty of people get the same problem, and finding help is not cheating.... -log(PH)=H -log(POH)=OH [OH][H]/[HA]=Ka Kw=1*10^-14 Kw/Ka=Kb those are the equations you need, just solve it... I don't see the cheating in help and I'M A