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0 cvg.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take&takeAssignmentSessionLocator-assignment-take; 16.5 [Review Topics 1. Titration Curve: Weak Acid/Stron... 1pt 1req Use the References to access important values if needed for this question Preparation What is the pH at the equivalence point in the titration of a 26.1 mL sample of a 0.373 M aqueous nitrous acid solution with a 0.410 M aqueous barium hydroxide solution? 2. Titration Curve. Weak Base/Stro pt 1req Submit Answer Retry Entire Group 8 more group attempts remaining Progress: v2 groups Due Mar 11 at 11:55 PM PreviouS Next Finish Assignment Save and Exit

Explanation / Answer

mmoles of nitrous acid = HNO2 = 26.1 x 0.373

                                    = 9.735

mmoles of Ba(OH)2 = 9.735 / 2

                                = 4.8675

moles = molarity x volume

4.8675 = 0.410 x v

V = 11.87 mL

volume of Ba(OH)2 = 11.87 mL

At equivalence point : salt only remains.

salt concentration = 9.735 / 11.87 + 26.1 = 0.256 M

pH = 7 + 1/2 (pKa + log C )

     = 7 + 1/2 (3.25 + log 0.256)

pH = 8.33

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