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Calculate the pH of a solution that is 0.250 M in HClO4 and 0.125 M in...

Calculate the pH of a solution that is 0.250 M in HClO4 and 0.125 M in CH3COOH (Ka = 1.8 x 10-5)

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I solved the question according to the mixture of HClO4 & CH3COOH.

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