1) The nickel sulfate is a green solution

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1) The nickel sulfate is a green solution. What color light does it absorb? Why is a red light source used in this experiment? If the solution to be studied was orange, what color light source should be used?

2)When you "set the intercept = 0" in Excel, the line passes through the origin. Why is this done in a plot of Absorbance vs. Concentration?

3)If a line is a good fit to a linear curve-fit equation, the coefficient of correlation, R2, is greater than 0.99. Does your data meet that standard?

4)Solve the linear curve-fit equation of the calibration curve to predict the absorbance of a 0.50 M NiSO4 solution

5)Suppose you wish to include more standards in your calibration curve, and 3 mL of 0.40 M NiSO4 is mixed with 7 mL of distilled water. Use the method shown in Example 1 to calculate the concentration of the resulting standard solution.

6)Why is it necessary to rinse the cuvette with the solution to be tested before the absorbance is measured?