Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25°C.

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  1. extremely easy. Sorry! pH=1 and pOH = 13

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  2. Nope. Tricky question.
    Suppose you take 1 L of each. That gives you 1 L x 0.025 mol/L HCl = 0.025 mols.

    1L x 0.075 mol/L HBr = 0.075 mols.
    Total mols = 0.025+0.075 = 0.1 mol but what's the volume? The volume is 2L so
    M = 0.1 mol/2.0L = 0.05 M for H^+. Take pH and pOH from that. I get about 1.3 and 12.7.

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