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Chapter 18: Q35P (page 459)
Consider a molecule that can fluoresce from the S1 state and phosphoresce from the T1 state. Which is emitted at longer wavelength, fluorescence or phosphorescence? Make a sketch showing absorption, fluorescence, and phosphorescence on a single spectrum.
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In a different titration, the absorbance after adding 75 mL of ferric nitrilo-triacetate to 1.500 mL of Apo transferrin was 0.222. Find the corrected absorbance.
A compound with molecular mass 292.16g/molwas dissolved in a 5 - mLvolumetric flask. A1.00 - mLaliquot was withdrawn, placed in a 10 - mLvolumetric flask, and diluted to the mark. The absorbance atwas in 0.427 i acuvet. The molar absorptivity at 340nm is
(a) Calculate the concentration of compound in the cuvet.
(b) What was the concentration of compound in the 5 - mL flask?
(c) How many milligrams of compound were used to make the 5 - mLsolution?
Preparing standards for a calibration curve.
(a) How much ferrous ethylene diammonium sulfateshould be dissolved in a 500mL volumetric flask withto obtain a stock solution with?
(b) When making stock solution (a), you actually weighed out 1.627 g of reagent. What is the Fe concentration in role="math" localid="1668357579931" ?
(c) How would you prepare 500 mL of standard containing 1,2,3,4, andinfrom stock solution (b) using any Class A pipets from Table 2-4 with only 500 -mL volumetric flasks?
(d) To reduce the generation of chemical waste, describe how you could prepare 50 mL of standard containing, andinfrom stock solution (b) by serial dilution using any Class A pipets from Table 2-3 with only 50mL volumetric flasks?
18-27. The iron-binding site of transferrin in Figure 18-8 can accommodate certain other metal ions besides Fe and certain other anions besidesData are given in the table for the titration of transferrin ( 3.57 mg in 2.00 mL ) with 6.64 mM solution in the presence of the anion oxalate, , and in the absence of a suitable anion. Prepare a graph similar to Figure 18-11, showing both sets of data. Indicate the theoretical equivalence point for the binding of one and two ions per molecule of protein and the observed end point. How many ions are bound to transferrin in the presence and in the absence of oxalate?
Standard addition. Selenium from 0.108 g of Brazil nuts was converted into the fluorescent product in Reaction 18-15, and extracted into 10.0 mL of cyclohexane. Then 2.00 mL of the cyclohexane solution were placed in a cuvet for fluorescence measurement. Standard additions of fluorescent product containingSe/mL are given in the table. Construct a standard addition graph to find the concentration of Se in the 2.00-mL unknown solution. Find the wt%of Se in the nuts and its uncertainty and 95% confidence interval
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