The volumes of a 1.10 ppm standard solution of Zn²⁺ shown in the following table were pipetted into separatory funnels each containing 5.00 mL of an unknown zinc solution. Each was extracted with three 5-mL aliquots of CCl₄ containing an excess of 8-hydroxyquinoline. The extracts were then diluted to 25.0 mL, and their fluorescence measured with a fluorometer. The results were:

(a) Construct a working curve from the data.
(b) Calculate a linear least-squares equation for the data.
(c) Calculate the standard deviation of the slope and the standard deviation about regression.
(d) Calculate the concentration of zinc in the sample.
(e) Calculate a standard deviation for the result in part (d).

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Volume Std Zn+, mL Fluorometer Reading 0.000 6.12 4.00 11.16 8.00 15.68 20.64 12.00