Sapling Learning Calibration data for an electrochemical determination of glucos

Question

Sapling Learning Calibration data for an electrochemical determination of glucose are in the following table. Because these data of magnitude, If plotted on a linear graph most of the points will be near the origin. A logarithmic plot overcomes this difficulty, leading to a more even distribution of the data. Glucose (ugimL) Current (nA) Glucose (ugi/mL) 3.01 Current (nA) 0.00813 0.0331 0.109 107 324 1020 3470 0.416 1.55 4.74 11.0 37.2 9.82 33.9 123 363 0.992 a) Plot log(nA) as a function of Number Determine the equation of the line in the form log(nA) = m, x logug/mL) + b. (b) What tion of Number glúcose coresponds to a signal of 87.9 nA? ? Hint

Explanation / Answer

the data point of log C(concentration in ug/ml) ( on x- axis) and log nA ( on y- axis) is drawn and shown with the data points.

the equation of best fit is log (nA)= 0.9378*logC+1.5784

given nA= 87.9

from the plot, log (87.9)= 0.9378*logC+1.5784

1.944= 0.9378*logC+1.5784

logC= (1.944-1.5784)/0.9378=0.3898

C= 1.476 ug/ml

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