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What is pKa

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    What is pKa
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    it is pka= -log ka
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    Damn i also need the defination ?
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    The negative logarithm of the acid dissociation constant is the definition.
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    i understand that but what is its relevance? e.g like on the graph ph=0.5pKa???i don't understand its importance
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    I think you are referring to buffers. At the point of half neutralisation, the acid and its conjugate base are at equal concentrations

    Ka= [H+][A-]/[HA]

    But when [HA]=[A-] half way through the reacion, this cancels down to Ka=[H+]
    => pKa=pH
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    i see!!having it in easier terms helps alot. thanks matey!

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Updated: June 16, 2007
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