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Acid base titrations and pH.

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Calculate the pH when 25.0 mL 0.20M HCl is titrated with 30.0mL of .20 M NH3 Kb(NH3)=1.8x10^-5.

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So molar concentration of acid [acid] = 0.20/25*10-3
[Acid] = 8

Molar concentration of base [base] NH3 = 0.20/30*10-3
...

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