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Titration, how does it work?

Discussion in 'MCAT Study Question Q&A' started by destroythemcat, Sep 6, 2014.

  1. destroythemcat

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    I'm a bit confused about titrations.

    When an acid is being titrated by a strong base.

    Acid before titration: HA-->H+ + A-

    When the strong base is added, lets say NaOH:

    1. Do the hydroxide ions reacts with H+ --> h2O and shift the equation to the right

    2. Or do the hydroxide ions react with HA causing the reaction to shift?

    hope someone can help me out
     
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  3. kraskadva

    kraskadva ...
    7+ Year Member

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    the OH- reacts with the H+ to form water.
    A- & B+ can either hang out in solution as spectator ions or come together to form a salt and precipitate out of solution.

    If you're starting with a strong acid, all the HA has dissociated to H+ & A- before the base is added and the equation doesn't shift back.
    If you're starting with a weak acid, as the OH- removes H+ from solution, the initial HA --> H+ & A- can shift further to the right (Le Chatlier's Principle) but will still eventually reach equilibrium and then be overwhelmed by the OH- as you continue to add base.
     
  4. destroythemcat

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    thank you!
     
    kraskadva likes this.

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