The digestion of a 0 1432 g sample of a compound containing phosphorous in a mixture of HNO3 and H2SO, resulted in the formation of CO, H20 and H3P04 Addition of ammonium molybdate yielded a solid having the composition (NH)3PO4 12M0O3 (MW=1876.3 g/mol). This precipitate was filtered, washed, and dissolved in 50.00 mL of 0 2000 M NaOH: (NH4)3PO4-12Mo03(s)+ 26OH (aq) HPO,2 (aq) +12M0O,2 (aq) +14H20(1) + 3NH3(g) After the solution was boiled to remove NH the excess NaOH was titrated with 14.71mL of 0.1741 M HCI to a phenolphthalein end point (back titration). Calculate the percentage of phosphorous in the solid sample. O 6.19% 10.6% O 27.6% 0.238% O 19.5
The digestion of a 0 1432 g sample of a compound containing phosphorous in a mixture of HNO3 and H2SO, resulted in the formation of CO, H20 and H3P04 Addition of ammonium molybdate yielded a solid having the composition (NH)3PO4 12M0O3 (MW=1876.3 g/mol). This precipitate was filtered, washed, and dissolved in 50.00 mL of 0 2000 M NaOH: (NH4)3PO4-12Mo03(s)+ 26OH (aq) HPO,2 (aq) +12M0O,2 (aq) +14H20(1) + 3NH3(g) After the solution was boiled to remove NH the excess NaOH was titrated with 14.71mL of 0.1741 M HCI to a phenolphthalein end point (back titration). Calculate the percentage of phosphorous in the solid sample. O 6.19% 10.6% O 27.6% 0.238% O 19.5
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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:The digestion of a 0.1432 g sample of a compound containing phosphorous in a mixture of HNO3
and H2SO, resulted in the formation of CO2, H2O and H3PO4 Addition of ammonium molybdate
yielded a solid having the composition (NH)3PO, 12M0O3 (MW=1876.3 g/mol). This precipitate
was filtered washed, and dissolved in 50 00 mL of 0.2000 M NaOH:
(NH,)3PO4-12MO03(s)+ 26OH (aq)
HPO,2 (aq) +12M00,2 (aq) +14H2O(1) + 3NH3(g)
After the solution was boiled to remove NH3, the excess NaOH was titrated with 14.71mL of 0.1741
M HCI to a phenolphthalein end point (back titration). Calculate the percentage of phosphorous
in the solid sample.
6.19%
10.6%
O 27.6%
O0 238%
O 19.5
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