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March 30, 2017

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For 105ml of a buffer that is .40 M in HOCL and .36M in NaOCL what is the pH after 13.4 ml of 1.5M NaOH is added?

Ka for HOCL is 3.5x10^-8

  • Chemistry - ,

    105 mL x 0.4M = 42.0 millimoles HOCl
    105 mL x 0.36M = 37.8 mmoles NaOCl.
    13.4 mL x 1.5M NaOH = 20.1 mmoles NaOH.

    .........HOCl + OH^- ==> OCl^- + H2O
    Initial..42.0...0........37.8.....
    add............20.1.................
    change..-20.1..-20.1.....+20.1
    equil.....?.....0.........?

    Substitute the equil line into the Henderson-Hasselbalch equation and solve for pH.

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