hello dear friends,
Can anyone help with the following questions from Principles of Instrumental Analysis book? I need to find the solution but I couldn't find it on the internet. I can't look at the places I found because it is paid.
Thanks in advance for everything.
1) The following volumes of a solution containing 1.10 ppm Zn2+ were pipetted into separatory funnels each containing 5.00 mL of an unknown zinc solution: 0.00, 1.00, 4.00, 8.00 and 12.00. 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 as follows: Volume Std. Zn2+ / mL Fluorometer Reading 0.00 6.12 1.00 7.41 4.00 11.16 8.00 15.68 12.00 20.64
a) Construct a standard curve b) Calculate a linear least squares equation for the data c) Calculate the concentration of the zinc in the unknown sample d) Calculate the standard deviation of the initial ordinate of the slope and the standard deviation associated with the regression.
2) Quinine in a 1.664-g antimalarial tablet was dissolved in sufficient 0.10 M to give 500 mL of solution. A 15.00-mL aliquot was then diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm provided a reading of 327 on an arbitrary scale. A standard 100 ppm quinine solution registered 180 when measured under conditions identical to those for the diluted sample. Calculate the mass of quinine in milligrams in the tablet.