To quantify the concentration of copper II sulfate in a given solution using the spectrophotometry technique, you can follow these steps:1. Prepare a series of standard solutions: First, prepare a stock solution of known concentration of copper II sulfate. Then, create a series of standard solutions with varying concentrations by diluting the stock solution. For example, you can prepare 5 standard solutions with concentrations of 10, 20, 40, 60, and 80 ppm parts per million or any other suitable range depending on the expected concentration of your sample.2. Measure the absorbance of standard solutions: Using a spectrophotometer, measure the absorbance of each standard solution at the wavelength of maximum absorbance max for copper II sulfate, which is typically around 810 nm. Make sure to measure the absorbance of a blank solution distilled water or the solvent used to prepare the standard solutions as well to account for any background absorbance.3. Plot a calibration curve: Create a graph with the concentration of the standard solutions on the x-axis and their corresponding absorbance values on the y-axis. Fit a linear regression line to the data points, and determine the equation of the line y = mx + b , where m is the slope and b is the y-intercept.4. Measure the absorbance of the unknown solution: Dilute the unknown copper II sulfate solution, if necessary, and measure its absorbance at the same wavelength max used for the standard solutions. Make sure to subtract the absorbance of the blank solution to obtain the corrected absorbance value.5. Calculate the concentration of the unknown solution: Using the equation of the calibration curve, plug in the corrected absorbance value of the unknown solution for y, and solve for x, which represents the concentration of copper II sulfate in the unknown solution. If you diluted the unknown solution before measuring its absorbance, make sure to account for the dilution factor when calculating the final concentration.By following these steps, you can accurately quantify the concentration of copper II sulfate in a given solution using the spectrophotometry technique.