Review of Stock Glucose Concentration and Error Calculation In this particular case, we need to obtain the absolute error (in mg/dL) for the concentration of the stock glucose solution. To do so, we need the concentration of the stock solution, and we need the relative error of the stock solution concentration. We can easily calculate the concentration to be 500.3 mg/dL for the stock solution. Once we have the relative error of the stock concentration, we merely multiply the relative error times the stock concentration to obtain the absolute error in the concentration of the stock solution; we must be mindful of the significant figures to make sure that the error and stock concentration have the same last digit of significance. Now, we need the relative error of the concentration of the stock glucose. Due to the fact that we used a mathematical manipulation to obtain the stock concentration, namely, the division of the glucose mass of 500.3 mg/dL by the volume of 100.00 mL, we MUST calculate the relative errors of the mass and the volume used. I assume that you can figure out that calculation. Now, once we have the two relative errors, we can calculate the relative error of the concentration by taking the square root of the sum of the squares of the two relative errors of the mass and volume. Once that value is obtained, we merely multiply the relative error times the stock concentration to obtain the absolute error in the concentration of the stock solution, with the sig fig issues addressed.
Posted on: Sun, 19 Jan 2014 21:10:48 +0000
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