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Concentration Calc Help Watch

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    Can anyone help, how do i find the undiluted concentration of H2SO4, 100cm3 was diluted with water to make a 1.00 dm3 solution.

    I know from my previous calc that the concentration of the diluted H2SO4 was 0.625 moldm3 (moles 0.0125 / vol 0.02 dm3)

    but am struggling with the last bit
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    (Original post by redfoo12)
    Can anyone help, how do i find the undiluted concentration of H2SO4, 100cm3 was diluted with water to make a 1.00 dm3 solution.

    I know from my previous calc that the concentration of the diluted H2SO4 was 0.625 moldm3 (moles 0.0125 / vol 0.02 dm3)

    but am struggling with the last bit
    Your initial dilution was from 100 to 1000ml

    This is a 10 fold (x10) dilution.

    This makes a concentration ten times more dilute.

    Hence the original solution was ten times more concentrated.
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    (Original post by charco)
    Your initial dilution was from 100 to 1000ml

    This is a 10 fold (x10) dilution.

    This makes a concentration ten times more dilute.

    Hence the original solution was ten times more concentrated.
    so if concentration of 0.02dm3 diluted was 0.625 moldm3 then the 100 would be 10 x 0.625 = 6.25 moldm3 conc

    is that correct
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    (Original post by redfoo12)
    so if concentration of 0.02dm3 diluted was 0.625 moldm3 then the 100 would be 10 x 0.625 = 6.25 moldm3 conc

    is that correct
    If I understand you correctly...

    You dilute a stock solution by a factor of 10

    Then you test the concentration of a 20ml sample which turns out to be = 0.625 M

    If so, yes.
 
 
 
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