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    Hiya, if i have a graph of pathlength against absorbance how do i calculate the molar exctinction coefficient, I know it is something to do with the gradient but am not sure(the concentration remains constant throughout). Thanks for the help

    -bald
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    (Original post by Baldywaldy)
    Hiya, if i have a graph of pathlength against absorbance how do i calculate the molar exctinction coefficient, I know it is something to do with the gradient but am not sure(the concentration remains constant throughout). Thanks for the help

    -bald
    Absorbance = E x c x l

    So a graph of pathlength (l) against absorbance has a gradient = E (provided the concentration remains constant)
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    (Original post by charco)
    Absorbance = E x c x l

    So a graph of pathlength (l) against absorbance has a gradient = E (provided the concentration remains constant)
    I thought the units for E where mol-1dm3 but if it was the gradient the gradient would have units cm-1?
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    (Original post by Baldywaldy)
    I thought the units for E where mol-1dm3 but if it was the gradient the gradient would have units cm-1?
    litres per mol per centimetre..

    ... even though the concentration is constant you still have to factor in its dimensions
 
 
 
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