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  • Someone please check this urgently

    Given a 20% w/v solution of Chlorhexidine Gluconate, what volume is required to make the following solutions.

    2 litres of a 0.2%

    I did C1V1 = C2V2

    So: 20V1= 0.2*2000

    so v1= 0.2*2000/ ( 20) = 20ml.

    However my friend says that the 0.2 has to be divided by 100 before you do anything. Help please!
    Last edited by Asterix; 30, July 2008, 07:51 PM.
    3rd yr pharmacy student - bath

  • #2
    Re: Someone please check this urgently

    I agree with you.

    2,000 mls of 0.2%

    equals 200mls of 2%

    equals 20mls of 20%

    johnep

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    • #3
      Re: Someone please check this urgently

      Originally posted by johnep View Post
      I agree with you.

      2,000 mls of 0.2%

      equals 200mls of 2%

      equals 20mls of 20%

      johnep
      so my method is right yeah? if it says 1% you would just go with 1% right, not do 1/100 first yeah?
      3rd yr pharmacy student - bath

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      • #4
        Re: Someone please check this urgently

        1% is 1/100.

        You should have done conversion of fractions to decimals at junior school.
        johnep

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