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500 ml of 0.150M sodium hydroxide is mixed to 595 mL of 0.200M weak acid determine the pH of the resulting buffer if Ka = 1.26x10^-5?

Enough of a monoprotic acid is added in H₂O to form a solution of 0.0190 M. compute the Ka for the acid if the pH of the resulting solution = 6.36..

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