To determine the concentration of the analyte in the water sample, the student needs to follow these steps:1. Measure the absorbance of the water sample using the spectrophotometer. Record the absorbance value.2. Obtain the calibration curve data, which is a graph or table showing the relationship between absorbance and concentration for the analyte. This data is usually obtained by measuring the absorbance of several standard solutions with known concentrations of the analyte.3. Locate the absorbance value of the water sample on the calibration curve. This can be done by finding the point on the curve that corresponds to the measured absorbance value.4. Determine the concentration of the analyte in the water sample by reading the corresponding concentration value from the calibration curve. This can be done by drawing a line from the point on the curve to the concentration axis usually the x-axis and reading the concentration value at the intersection.If the calibration curve is given as an equation e.g., y = mx + b, where y is absorbance, x is concentration, m is the slope, and b is the y-intercept , you can calculate the concentration of the analyte by plugging the absorbance value into the equation and solving for x:Concentration x = Absorbance y - y-intercept b / slope m By following these steps, the student can determine the concentration of the analyte in the water sample using colorimetry, the spectrophotometer, and the calibration curve data.