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Chapter 18: Q17P (page 457)
What is the purpose of neocuproine in the serum iron analysis?
The purpose of neocuproine in the serum iron analysis is the it reacts with Cu(I), so it cannot form complex with ferrozine. Ferrozine gives false positive result in analysis.
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18-26. A 2.00mL solution of apotransferrin was titrated as illustrated in Figure 18-11. It required 163L of 1.43 mM ferric nitrilotriacetate to reach the end point.
(a) Why does the slope of the absorbance versus volume graph change abruptly at the equivalence point?
(b) How many moles of Fe(III) (= ferric nitrilotriacetate) were required to reach the end point?
(c) Each apotransferrin molecule binds two ferric ions. Find the molar concentration of apotransferrin in the 2.00mL solution.
(a) A solution of compound A exhibited an absorbance of 0.624 at 238nmin a 1.000 cmcuvet; a blank solution containing only solvent had an absorbance of 0.029at the same wavelength. Find the molar absorptivity of compound A.
(b) The absorbance of an unknown solution of compound A in the same solvent and cuvet was 0.375 at 238 nm. Find the concentration of A in the unknown.
(c) A concentrated solution of compound A in the same solvent was diluted from an initial volume ofto a final volume of 25.00mLand then had an absorbance of 0.733. What is the concentration of A in the concentrated solution?
0.10mMhas an absorbance maximum of 0.26 at 525 nm in a
1.000-cm cell. Find the molarabsorptiveand the concentration of a solution whose
absorbance is 0.52 at 525 nm in the same cell.
18-9 Why does a compound whose visible absorption maximum is at 480 nm (blue-green) appear to be red?
When I was a boy, Uncle Wilbur let me watch as he analyzed the iron content of runoff from his banana ranch. A 25.0 - mLsample was acidified with nitric acid and treated with excess KSCN to form a red complex. (KSCN itself iscolorless.) The solution was diluted to 100.0mLand put in a variable-pathlength cell. For comparison, a 10.0 - mLreference sample ofwas treated with andand diluted to. The reference was placed in a cell with a 1.00 - mL light path. The runoff sample exhibited the same absorbance as the reference when the path length of the runoff cell was 2.48cm. What was the concentration of iron in Uncle Wilbur’s runoff?
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