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Math Help - undoing logs in chemistry

  1. #1
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    Aug 2008
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    undoing logs in chemistry

    It may seem easy but i have an exam soon and i have forgotten how to undo logs!
    This is for chemistry and involves the equation to find pH.

    pH = -log [concentration of Hydronium Ions]

    or in more maths terms

    y = -log x


    I can't really believe i have forgotten this but i just cant do it. I need 'x' to be the subject.

    Thanks.
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  2. #2
    Member
    Joined
    May 2008
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    106
    For pH you use log to the base 10, the inverse of this is raising the log to the power of 10
    i.e.
    10^{\text{Log}_{10}(x)}=x

    in your case

    \text{pH}=-\text{Log}_{10}[\text{H}_3\text{O}^{+}]

    -\text{pH}=\text{Log}_{10}[\text{H}_3\text{O}^{+}]

    [\text{H}_3\text{O}^{+}]=10^{-\text{pH}}
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  3. #3
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    Aug 2008
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    ahh thanks.
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