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Math Help - Logarithm - Calculator Question

  1. #1
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    Logarithm - Calculator Question

    Hello all,

    I'm having a problem on how to input this in my calculator:
    1.033 = log ([HCO3-]/ [H2CO3])

    The answer from this problem is this:
    [HCO3-]/ [H2CO3] = 10.8

    I tried doing this...

    10^-1.033 but I get this instead of 10.8: 0.092682982
    I know that we have to do that step but I don't know what to do with that number. I tried adding it to 1.033 but it obviously doesn't get me the 10.8 answer.

    By the way... 10.8 is the ratio between [HCO3-] and [H2CO3].

    Thanks. I'll just be here to reply so don't hesitate to help me out. =)
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  2. #2
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    e^(i*pi)'s Avatar
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    West Midlands, England
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    Quote Originally Posted by 1434runescape View Post
    Hello all,

    I'm having a problem on how to input this in my calculator:
    1.033 = log ([HCO3-]/ [H2CO3])

    The answer from this problem is this:
    [HCO3-]/ [H2CO3] = 10.8

    I tried doing this...

    10^-1.033 but I get this instead of 10.8: 0.092682982
    I know that we have to do that step but I don't know what to do with that number. I tried adding it to 1.033 but it obviously doesn't get me the 10.8 answer.

    By the way... 10.8 is the ratio between [HCO3-] and [H2CO3].

    Thanks. I'll just be here to reply so don't hesitate to help me out. =)
    You took the negative exponent when you should have taken the positive exponent (because there is no minus sign on the 1.033)

    10^{1.033} = 10.8 (3sf)
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  3. #3
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    Quote Originally Posted by e^(i*pi) View Post
    You took the negative exponent when you should have taken the positive exponent (because there is no minus sign on the 1.033)

    10^{1.033} = 10.8 (3sf)
    OH. HAHA. My bad. Thanks for answering my question!
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  4. #4
    Newbie Bill Zimmerly's Avatar
    Joined
    Nov 2009
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    Hillsboro, Missouri, USA
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    Wink

    Quote Originally Posted by 1434runescape View Post
    OH. HAHA. My bad. Thanks for answering my question!
    Don't forget to click the "Thank You" button for e^(i*pi), 1434runescape.
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