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? Still waiting for OP to respond so we can find out whether he typoed 'to find ph' instead of 'to find pOH'. if it's to find pH I can see where you're coming from, but my calculations are only.giving me 3.5 when I find pOH, and if it's to find pOH I don't understand how proticness of an unknown...

Are you sure you didn't mean pOH of the rainwater = 3.5 and not pH of rainwater is 3.5? Assuming ^ is true: -log10 [ (0.0095 * 0.0083)/0.25 ] = 3.501138311 = 3.5 =pOH Otherwise if it's to find the pH then: 14+ log10 [ (0.0095 * 0.0083)/0.25 ] = 10.498886169 = pH