
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Transcribed Image Text:Same CUInUitiulIS !
2.
Virtual Lab Question: Phosphorus in urine can be determined by treating with molybdenum (VI) and
then reducing the phosphomolybdo complex with aminonaphtholsulfonic acid to give the
characteristic molybdenum blue color. This absorbs at 690 nm. A patient excreted 1270 mL of urine
in 24 hours and the pH of the urine was 6.5. A 1.00 mL aliquot of the urine was treated with
molybdate reagent and aminonaphtholsulfonic acid and was diluted to a volume of 50.0 mL.
A series of phosphate standards were similarly treated. The absorbance of the solutions at 690 nm,
measured against a blank, were as follows:
Solution
Absorbance
а.
Calculate the number of grams of phosphorus
excreted per day.
1.00 ppm P
0.205
b. Calculate the phosphorus concentration in the urine
2.00 ppm P
0.41
as millimoles per liter.
3.00 ppm P
0.615
Virtual Lab Questions
4.00 ppm P
0.82
a. Compare the magnetic character, bond lengths,
bond orders, bond dissociation energies, and
Urine sample
0.625
nization energies for N2. N2", and N22-,
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