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Thread: Can someone please check my calculations? (pretty basic stuff)

  1. #1 Can someone please check my calculations? (pretty basic stuff) 
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    Jun 2013
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    i'm finding the concentration of OCl- by titration. I diluted 50ml of S2O3 (0.2molL-1) with 200ml H2O in a 250ml volumetric flask. So the concentration of the diluted S2O3 is:
    (m1)*(v1)=(m2)*(v2)
    0.2*0.05=(m1)*0.25 (volume is in litres)
    (m1)= 0.04molL-1 S2O3
    the volume of S2O3 in the titration is 0.02428L
    moles of S2O3: n=cv
    n=0.04*0.02428
    n=9.712*(10^-4)mol


    mole ratio of S2O3:OCl is 2:1
    Therefore mo. of moles of OCl:
    (9.712*(10^-4))/2=4.856*(10^-4)mol
    volume OCl: 0.02L
    concentration of OCl:
    c=n/v
    c=(4.856*(10^-4))/0.02
    c=0.02428molL-1


    However, I also diluted the OCl by adding 20ml OCl to 230ml H2O in a 250ml volumetric flask.
    (m1)*(v1)=(m2)*(v2)
    (m1)*0.02=0.02428*0.25
    (m1)=(0.02428*0.25)/0.02
    (m1)=0.3035molL-1
    Therefore the concentration of OCl is 0.3035molL-1


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