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EXERCISE III - 5 1. A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCI and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K,O in the silicate. 2. The bismuth in 0.7405 g of an alloy was precipitated as BiOCI and separated from the solution by filtration. The washed precipitate was dissolved in nitric acid and treated with 10.00 mL of 0.1498 M AGNO3, causing the precipitation of AgCl. The excess AgNO3 required 12.92 mL of 0.1008 M KSCN for titration. Calculate the %Bi in the sample. 3. The phosphate in a 3.000 g sample of industrial detergent was precipitated by the addition of 1.000 g of AGNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN for titration to the FeSCN2* end point. Calculate the percentage of phosphate in the detergent. 4. What weight of sample must be used in the Mohr method for chloride so that two times the volume of 0.1016 M AGNO3 used will equal the % KCI in the sample? 5. Chloride in a brine solution is determined by the Volhard method. A 10.00 mL aliquot of the solution is treated with 15.00 mL standard 0.1182 M A9NO3 solution. The excess silver is titrated with standard 0.1010 M KCNS solution, requiring 2.38 mL to reach the endpoint. Calculate the concentration of chloride in g NaCl/liter.

EXERCISE III - 5 1. A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCI and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K,O in the silicate. 2. The bismuth in 0.7405 g of an alloy was precipitated as BiOCI and separated from the solution by filtration. The washed precipitate was dissolved in nitric acid and treated with 10.00 mL of 0.1498 M AGNO3, causing the precipitation of AgCl. The excess AgNO3 required 12.92 mL of 0.1008 M KSCN for titration. Calculate the %Bi in the sample. 3. The phosphate in a 3.000 g sample of industrial detergent was precipitated by the addition of 1.000 g of AGNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN for titration to the FeSCN2* end point. Calculate the percentage of phosphate in the detergent. 4. What weight of sample must be used in the Mohr method for chloride so that two times the volume of 0.1016 M AGNO3 used will equal the % KCI in the sample? 5. Chloride in a brine solution is determined by the Volhard method. A 10.00 mL aliquot of the solution is treated with 15.00 mL standard 0.1182 M A9NO3 solution. The excess silver is titrated with standard 0.1010 M KCNS solution, requiring 2.38 mL to reach the endpoint. Calculate the concentration of chloride in g NaCl/liter.

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Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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EXERCISE III - 5 1. A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H,0, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate. 2. The bismuth in 0.7405 g of an alloy was precipitated as BIOCI and separated from the solution by filtration. The washed precipitate was dissolved in nitric acid and treated with 10.00 mL of 0.1498 M AGNO3, causing the precipitation of AgCl. The excess AGNO3 required 12.92 mL of 0.1008 M KSCN for titration. Calculate the %Bi in the sample. 3. The phosphate in a 3.000 g sample of industrial detergent was precipitated by the addition of 1.000 g of AgNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN for titration to the FeSCN* end point. Calculate the percentage of phosphate in the detergent. 4. What weight of sample must be used in the Mohr method for chloride so that two times the volume of 0.1016 M AGNO3 used will equal the % KCI in the sample? 5. Chloride in a brine solution is determined by the Volhard method. A 10.00 mL aliquot of the solution is treated with 15.00 mL standard 0.1182 M AGNO3 solution. The excess silver is titrated with standard 0.1010 M KCNS solution, requiring 2.38 mL to reach the endpoint. Calculate the concentration of chloride in g NaCl/liter.
Transcribed Image Text:EXERCISE III - 5 1. A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H,0, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate. 2. The bismuth in 0.7405 g of an alloy was precipitated as BIOCI and separated from the solution by filtration. The washed precipitate was dissolved in nitric acid and treated with 10.00 mL of 0.1498 M AGNO3, causing the precipitation of AgCl. The excess AGNO3 required 12.92 mL of 0.1008 M KSCN for titration. Calculate the %Bi in the sample. 3. The phosphate in a 3.000 g sample of industrial detergent was precipitated by the addition of 1.000 g of AgNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN for titration to the FeSCN* end point. Calculate the percentage of phosphate in the detergent. 4. What weight of sample must be used in the Mohr method for chloride so that two times the volume of 0.1016 M AGNO3 used will equal the % KCI in the sample? 5. Chloride in a brine solution is determined by the Volhard method. A 10.00 mL aliquot of the solution is treated with 15.00 mL standard 0.1182 M AGNO3 solution. The excess silver is titrated with standard 0.1010 M KCNS solution, requiring 2.38 mL to reach the endpoint. Calculate the concentration of chloride in g NaCl/liter.
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