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pH of solution during titration process

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Q1: What is the pH of a 0.35 M solution of a weak acid HA with Ka = 1.41×10^-8?

Q2: A 25.0 mL sample of the acid is titrated against 1.9 M NaOH. What is the pH after 5.0 mL of the base has been added?

Q3: What is the pH after 10.0 mL of base has been added?

Q4: What is the pH when 30.0 mL of base have been added?

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Solution Summary

The solution explains how to calculate the pH of the solution during titration process, where different amount of titrant NaOH was added (see attachment).