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Thread: Titration equivalence point?

  1. #1 Titration equivalence point? 
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    Join Date
    Jun 2010
    20.0mL of 0.15mol/L HNO3(aq) is being added to 17mL of 0.23mol/L NH3(aq). What is the equivalence point?

    I'm not sure how to go about solving this, although I've certainly toyed with it a lot.

    What I've gotten is:
    HNO3 (aq) + NH4OH (aq) --> H2O (l) + NH4NO3 (aq)
    [NH4OH] = 3.9 x 10^-3
    (0.15mol/L)x = 3.9 x 10^-3
    x = 0.026
    26mL of HNO3 is not available in this reaction, so the equivalence point is not reached.

    Which I know is wrong because the weak base won't dissociate 100% like I'm assuming it will in my calculations, I really have no idea what to do here, I'd really appreciate a push in the right direction!

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