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16 Nov 2019
Consider the results of Part A showing the reproducibility of your measurements and explain why dropping the last decimal place of the readings in the plot should not affect the results. Determination of starch concentration of an unknown solution UNKNOWN: A B C (circle one) Absorbance of low standard (tube #2 in Table 3) = ___ Absorbance of high standard (tube #6 in Table 3) = ___ Calculation of starch concentration of unknown solution: Choose the first sample of the unknown that has an absorbance between the low and high standards. Use your standard curve (draw on it) to estimate amount of starch (in mu g) in this sample: Amount of starch in sample = ___ mu g starch 2) Calculate the volume of the unknown solution in the sample: ___ drops of unknown times 40 mu l/drop = ___ mu L unknown 3) Calculate the starch concentration of the unknown (use sig. figs.): ___ mu g starch/___ mu g unknown = ___ mu starch/mu L unknown End of lab check-out form Station # ___ is in
Consider the results of Part A showing the reproducibility of your measurements and explain why dropping the last decimal place of the readings in the plot should not affect the results. Determination of starch concentration of an unknown solution UNKNOWN: A B C (circle one) Absorbance of low standard (tube #2 in Table 3) = ___ Absorbance of high standard (tube #6 in Table 3) = ___ Calculation of starch concentration of unknown solution: Choose the first sample of the unknown that has an absorbance between the low and high standards. Use your standard curve (draw on it) to estimate amount of starch (in mu g) in this sample: Amount of starch in sample = ___ mu g starch 2) Calculate the volume of the unknown solution in the sample: ___ drops of unknown times 40 mu l/drop = ___ mu L unknown 3) Calculate the starch concentration of the unknown (use sig. figs.): ___ mu g starch/___ mu g unknown = ___ mu starch/mu L unknown End of lab check-out form Station # ___ is in