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OCR (Salters) Chemistry Investigation -- Colorimetry question watch

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    Hi,

    I am doing my Chemistry Individual Investigation at the moment. I am investigation the rate of reaction between Peroxydisulphate ions and Iodide ions-- using iodine clock method(sodium thiosulphate-as rate determining step) and then colorimetry.

    But, in the lab we have digital and analog colorimeters and i cannot decide which to use!

    Digital - can be temperamental, but gives data to more decimal places and is more exact.

    Analog - works easily, but is down to my human judgement and error and i cant record values to 3dp! also the dial is constantly moving so each 5 seconds i have to try and read the value in a second! and its mind numbing! especially when my reactions can go on for 30mins!

    Does anyone have any suggestions on which to use? my teachers dont want to guide me!!!


    Thanks
 
 
 
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