Twenty-five milliliters of 0.10 M HCl(aq)is titrated with 0.10 M NaOH(aq).What is the pH when 30 mL of NaOH(aq)have been added?

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When 25 mL of 0.10 M HCl is titrated with 30 mL of 0.10 M NaOH, the NaOH will completely neutralize the HCl and leave an excess of 5 mL of 0.10 M NaOH. The solution will be basic, and the pH will be greater than 7. The pH of a 0.10 M NaOH solution is about 13, but due to the dilution effect (55 mL total volume), the pH will be slightly lower, making 12.0 the closest correct option.

Twenty-Five Milliliters of 0