Pre-lab

24 Why should the mass of the Co(III) complex be measured immediately after removing it from the dessicator  

The Beer-Lambert equation predicts that the absorbance A of a solution at wavelength A is linearly proportional to the concentration (c, in mol 1 of the absorbing solute and the pathlength of sample that the light passes through (b, in cm). The Beer-Lambert equation, equation (2.5) is  

A plot of A vs c for a solution is commonly known as a Beer s law plot. Such a plot can be used to determine s for a metal complex electronic transition, provided that the pathlength, b, is known. A Beer s law plot can also be used to determine the concentration of a solute in solution when s for the solute is known simply by measuring the absorbance of the solution. In order to prepare a Beer s law plot, several solutions (at least four) of precisely known metal complex concentrations must be prepared and the absorbance of each measured. 

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Comparing How does the mass of a mole of split peas compare with the masses of gold, aluminum chloride, and glucose you calculated in the pre-lab ... 

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