Question

Heres are the steps that were followed...
ii) Nickel analysis - Prepare three standard nickel solutions using the following procedure. Accurately weigh approximately 1.0 g of [Ni(H20)6]504 into a 50 mL volumetric flask. Add 10 mL of D.I. water followed by 10 mL of 1 M H2SO4(aq) to dissolve the salt and then dilute to the mark with deionized water. Pipet 10 mL of the solution into one 25 mL volumetric flask and 15 mL into a second 25 mL flask, then dilute both to the mark with deionized water. Accurately weigh approximately 0.25 g of product (same one used in Parti above, as assigned by your instructor) into a 25 mL volumetric flask. Add 5 mL 1 M sulfuric acid to dissolve the salt and then dilute to the mark with DI water. Obtain absorption spectra for the four solutions using the SpectroVis Plus Spectrophotometers. Use the "Examine" function to locate the Amax of each spectrum (they all should have the same omax) and record the absorbances at this wavelength.

Please help. Let me know if their is any missing information.

Answer 1

Beer's law is as follows

A=$\varepsilon$bc where A is absorbance,$\varepsilon$ is molar absorptivity and b is path length and c is concentration.

Comparing the above equation with the general equation for a straight line y=mx+c. Here, the constant c is taken to be zero.

As per the given problem,concentation c lies on the x-axis and absorbance on the y-axis.

Thus,Beer's law can be mapped as A/c =  $\varepsilon$b (slope).

Of the four terms, A (absorbance),c (concentration) are given but path length is not given in the problem.

Thus, the missing information is path length.