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Using activities to calculate pH

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What is the final pH of a solution that originally consists of 30.0 mL of a citric acid buffer at a pH of 3.26 and an acid concentration of 6.67x10-2 M after 10.0 mL of 0.0750 M HBr is added? The pKa for citric acid is 3.13.

Using activities, find the pH of a solution of 0.0167 M Na2SO4 saturated with Mn(OH)2 (Ksp = 2.0×10-13).
What pH do you calculate if you ignore activities

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This solution helps explore how to use activities to calculate pH.

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