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A 20.0 mL sample of 0.432 M HBr is titrated with a 0.314 M NaOH solution....

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Chemistry

A 20.0 mL sample of 0.432 M HBr is titrated with a 0.314 M NaOHsolution. The pH after the addition of 35.0 mL of NaOH is__________.

A.0.04
B.1.37
C.12.53
D.12.63
E.13.33

Answer & Explanation Solved by verified expert
4.1 Ratings (716 Votes)

answer : option D) 12.63

millimiles of acid (HBr) = 20 x 0.432

                             = 8.64

millimoles of base (NaOH) = 35 x 0.314

                           = 10.99

millimoles of base > milli moles of acid

here base millimoles dominates the acid millimoles so

[OH-] = base millimoles - acid millimoles / total volume

          = 10.99 - 8.64 / (20 + 35)

          = 0.0427 M

pOH = -log [OH-]

        = -log (0.0427)

        = 1.37

pH + pOH = 14

pH = 14 - pOH

     = 14 - 1.37

    = 12.63

pH = 12.63
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