1. Refer to the given calibration curve above. Why can't this curve be used to determine the concentration of a Cu(NO3)2 solution that measured an absorbance at 630 nm of 0.825?

2. Refer to the calibr ation given curve above. Why can't this curve be used to determine the concentration of a Cu(NO3)2 solution that measured an absorbance at 530 nm of 0.235?

3. Refer to the calibration curve above. Can this curve be used to predict the absorbance that a 0.350 M solution of NiCl2 would have? Explain why or why not.

4. Refer to the calibration curve above. A student measures an unknown concentration solution of Cu(NO3)2 and finds it has an absorbance at 630 nm of 0.147. What is the concentration of the unknown?

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