A series of calibration standards gave the following results. Peak Height (arb. units) % w/w H,0 0.00 1.15 0.0145 2.74 0.0472 6.33 0.0951 11.58 0.1757 20.43 0.2901 32.97 (a) What is the %w/w H:O in a sample giving a peak height of 8.63? (b) The %w/w H2O in a freeze-dried antibiotic is determined in the following manner. A 0.175-g sample is placed in a vial along with 4.489 g of methanol. Water in the vial extracts into the methanol. Analysis of the sample gave a peak height of 13.66. What is the %w/w H;O in the antibiotic?
A series of calibration standards gave the following results. Peak Height (arb. units) % w/w H,0 0.00 1.15 0.0145 2.74 0.0472 6.33 0.0951 11.58 0.1757 20.43 0.2901 32.97 (a) What is the %w/w H:O in a sample giving a peak height of 8.63? (b) The %w/w H2O in a freeze-dried antibiotic is determined in the following manner. A 0.175-g sample is placed in a vial along with 4.489 g of methanol. Water in the vial extracts into the methanol. Analysis of the sample gave a peak height of 13.66. What is the %w/w H;O in the antibiotic?
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Zhou and colleagues determined the %w/w H;O in methanol by GC, using a capillary
column coated with a nonpolar stationary phase and a thermal conductivity detector.
A series of calibration standards gave the following results.
Peak Height
(arb. units)
% w/w H,0
0.00
1.15
0.0145
2.74
0.0472
6.33
0.0951
11.58
0.1757
20.43
0.2901
32.97
(a) What is the %w/w H2O in a sample giving a peak height of 8.63?
(b) The %w/w H2O in a freeze-dried antibiotic is determined in the following manner.
A 0.175-g sample is placed in a vial along with 4.489 g of methanol. Water in the vial
extracts into the methanol. Analysis of the sample gave a peak height of 13.66. What
is the %w/w H;O in the antibiotic?
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