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    So in the textbook there's a graph that shows that with increasing concentration of glucose- the transmission of light also increases. Surely if there's an increase in concentration of glucose- this a higher percentage of absorption and so a smaller percentage of transmission. The book is called ''OCR biology'' by pete kennedy and frank sochacki page 115 for anyone else who has this textbook
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    I don't have your textbook, but a reasonably decent knowledge of colorimetry. In my textbook it says that colorimetry works on the principle that a solution will absorb a certain wavelength of transmitted light. So for a start, the transmission shouldn't change over the course of the practical. However, the amount of light detected (absorbed) across the solution should indeed decrease as glucose concentration increases. I'm not too sure why your textbook says otherwise
 
 
 
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