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The Absorbance for the highest concentration of starch is lower than you might have expected. What is the most likely reason
You have series of starch solutions with known concentrations that you have prepared by serial dilution and which you measure
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Answer #1

The measurement was made inaccurately, and the Absorbance is probably lower than indicated. If we leave last reading of absorbance=2, and when we draw line touching all the other points from zero, the value of 0.05 g/L of starch concentration will be equal to abs=1, roughly. On the other hand, if we draw a line from zero to the last reading i.e. abs=2, the line will be more towards right side, and the value of 0.05 g/L of starch concentration will be roughly equal to abs=0.5, roughly. Therefore we can say that, absorbance is lower than the expected initially.

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