In order to analyze the wastewater containing cu2+ from a manufacturing process, 1.0L of water was evaporated to 10.0mL, then placed in a spectrophotometer tube. The absorbance was found to be 0.30. Using your calibration curve, calculate the number of milligram of Cu2+ in 1.0L of wastewater

To calculate the number of milligrams of Cu2+ in 1.0L of wastewater, we need to use the calibration curve. The calibration curve relates the concentration of Cu2+ to its corresponding absorbance value.

To construct a calibration curve, a series of standard solutions with known concentrations of Cu2+ are prepared. The absorbance of each standard solution is then measured using a spectrophotometer. The absorbance values and the corresponding concentrations are plotted on a graph, resulting in a calibration curve.

To use the calibration curve to determine the concentration of Cu2+ in the wastewater sample, we need to know the absorbance value obtained from the spectrophotometer. In this case, the absorbance is given as 0.30.

To find the concentration of Cu2+ in the wastewater sample corresponding to the absorbance value of 0.30, we can refer to the calibration curve. By drawing a vertical line from the absorbance value of 0.30 to the calibration curve, we can determine the corresponding concentration of Cu2+ in the wastewater sample.

Once we have the concentration of Cu2+ in the wastewater sample, we can convert it to milligrams per liter (mg/L). This can be done by multiplying the concentration by the molar mass of Cu2+ and converting the units accordingly.

Without the calibration curve data, it is not possible to directly calculate the number of milligrams of Cu2+ in 1.0L of wastewater. The calibration curve is essential for this calculation.