The volumes of a standard solution containing 1.10 ppm of Zn2+
shown in the 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
intercept 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