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    Infrared spectroscopy

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    On this site
    http://www.chemguide.co.uk/analysis/ir/interpret.html#top

    it shows an infra red spectrum of ethanoic acid and shows
    a very broad trough between 2500 - 3300 cm ^-1 taking this from the point where
    the line graph starts to drop it looks more like 2800 - 3800 cm ^-1
    do you have to take these measurements from the centre
    as it is most accurate . The absorption starts from where the line starts to drop.
    why take it from the centre?

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    https://brainmass.com/chemistry/experimental-design-and-methods-in-chemistry/infrared-spectroscopy-146706

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    Please refer to the file attached

    it shows an infra red spectrum of ethanoic acid and shows
    a very broad trough between 2500 - 3300 cm ^-1 taking this from the point where
    the line graph starts to drop it looks more like 2800 - 3800 cm ^-1 ...

    Solution Summary

    it shows an infra red spectrum of ethanoic acid and shows
    a very broad trough between 2500 - 3300 cm ^-1 taking this from the point where
    the line graph starts to drop it looks more like 2800 - 3800 cm ^-1
    do you have to take these measurements from the centre
    as it is most accurate . The absorption starts from where the line starts to drop.
    why take it from the centre?

    $2.49

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