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In a titration of a 100.0mL 1.00M HCl strong acid solution with 1.00M NaOH, what is...

In a titration of a 100.0mL 1.00M HCl strong acid solution with 1.00M NaOH, what is the pH of the solution after the addition of 138 mL of NaOH? (3 significant figures) **Remember to calculate the equivalence volume and think about in which region along the titration curve the volume of base falls, region 1, 2, 3, or 4**

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