To determine the concentration of lead Pb in the water sample, we need to use the calibration curve method. The calibration curve is a plot of absorbance versus concentration for a series of standard solutions with known concentrations. The equation for the calibration curve is usually in the form:Absorbance = m Concentration + bwhere m is the slope of the calibration curve, and b is the y-intercept.Unfortunately, the information provided is not sufficient to calculate the concentration of lead in the water sample directly. We need the calibration curve data slope and y-intercept to determine the concentration of lead in the sample.Once you have the calibration curve data, you can use the absorbance value of 0.456 to calculate the concentration of lead in the water sample using the equation mentioned above:Concentration = Absorbance - b / mPlease provide the calibration curve data slope and y-intercept to calculate the concentration of lead in the water sample.