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1) The 1.628 g stibnite sample containing antimony is dissolved in water to a volume of 250 mL. To 50 mL of this solution is added 15 mL of 0.0238 M KMNO4 to oxidize the antimony (III) antimony (V). Remaining permanganate is titrated with 3.82 mL 0.0961 M Fe2+ solution. Find the percentage of Sb2S3 in the sample. Sb: 121.75; S: 32.

1) The 1.628 g stibnite sample containing antimony is dissolved in water to a volume of 250 mL. To 50 mL of this solution is added 15 mL of 0.0238 M KMNO4 to oxidize the antimony (III) antimony (V). Remaining permanganate is titrated with 3.82 mL 0.0961 M Fe2+ solution. Find the percentage of Sb2S3 in the sample. Sb: 121.75; S: 32.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
Section: Chapter Questions
Problem 14.98QE
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Analytical Chemistry Laboratory Manual 91 PROBLEMS 1) The 1.628 g stibnite sample containing antimony is dissolved in water to a volume of 250 mL. To 50 mL of this solution is added 15 mL of 0.0238 M KMNO4 to oxidize the antimony (III) antimony (V). Remaining permanganate is titrated with 3.82 mL 0.0961 M Fe2+ solution. Find the percentage of Sb2S3 in the sample. Sb: 121.75; S: 32. 5SB3* +2MNO4 + 16 H 2MN²+ +5Sbst + 8H2O 5Fe2t + MnO4+8 H Mn2+ + 5FE3+ + 4 H20 2) A student who wants to make the determination of calcium, and he
Transcribed Image Text:Analytical Chemistry Laboratory Manual 91 PROBLEMS 1) The 1.628 g stibnite sample containing antimony is dissolved in water to a volume of 250 mL. To 50 mL of this solution is added 15 mL of 0.0238 M KMNO4 to oxidize the antimony (III) antimony (V). Remaining permanganate is titrated with 3.82 mL 0.0961 M Fe2+ solution. Find the percentage of Sb2S3 in the sample. Sb: 121.75; S: 32. 5SB3* +2MNO4 + 16 H 2MN²+ +5Sbst + 8H2O 5Fe2t + MnO4+8 H Mn2+ + 5FE3+ + 4 H20 2) A student who wants to make the determination of calcium, and he
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