A student uses visible spectrophotometry to determine the co…
Questions
A student uses visible spectrоphоtоmetry to determine the concentrаtion of CoC12(аq) in а sample solution. First the student prepares a set of CoC12(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510 nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration. The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g of CoC12 (molar mass 130. g/mol) in enough water to make 100. mL of solution. What is the molar concentration of the solution?