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0.1 M solution of weak acid has pH=4.0. Calculate pKa. 20 mL of 0.1 M solution...

0.1 M solution of weak acid has pH=4.0. Calculate pKa.

20 mL of 0.1 M solution of weak acid was mixed with 8 mL 0.1 M solution of NaOH. Measured pH was 5.12. Calculate pKa.

Calculate the pH of a 0.2M solution of ammonia. Ka=5.62×10-10.

Calculate pH of 0.01 M aniline hydrochloride. Aniline pKb=9.4.

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