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50.00 mL of a solution containing both Ni* and Pb2* ions requires 46.32 mL of a 0.02041 M EDTA solution for titration of both metals. A second 50.00 mL aliquot is treated with KCN to mask the nickel and then titrated with 30.28 mL of the same EDTA solution. Calculate the molarities of the Ni2 and Pb2* ions. acid and

50.00 mL of a solution containing both Ni* and Pb2* ions requires 46.32 mL of a 0.02041 M EDTA solution for titration of both metals. A second 50.00 mL aliquot is treated with KCN to mask the nickel and then titrated with 30.28 mL of the same EDTA solution. Calculate the molarities of the Ni2 and Pb2* ions. acid and

Chemistry
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
Chapter1: Chemical Foundations
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XERCISE IV- 3. 50.00mL of a solution containing both Ni2* and Pb2+ ions requires 46.32 mL of a 0.02041M EDTA solution for titration of both metals. A second 50.00 mL aliquot is treated with KCN to mask the nickel and then titrated with 30.28 mL of the same EDTA solution. Calculate the molarities of the Ni2 and Pb2+ ions. 2. A 0.5745 g sample of an alloy containing principally bismuth and lead is dissolved in nitric acid and diluted to 250.0 mL in a volumetric flask. A 50.00 mL aliquot is withdrawn, the pH adjusted to 1.5, and the bismuth titrated with 30.26 mL of 0.01024 M EDTA. The pH of the solution is then increased to 5.0 and the lead titrated with 20.42 mL of the same EDTA solution. Calculate the percentages of lead and bismuth in the alloy. 3. A standard solution of EDTA is prepared, and by titration each mL is found to complex with the Mg in 10.0 mL of a solution containing 0.300 g of MgCl2 per liter. A 100 mL pipetful of a certain well water is found to require 8.60 mL of the standard EDTA. With the knowledge that the conventional method of expressing water hardness in terms of ppm of CaCO3 regardless of the nature of the cations and anions actually present, what is the hardness of the well water? 4. A 60.00 mL of buffered solution (pH 10) containing Zn and Nit ions (from a chip sample) is analyzed using EDTA titration with EBT as indicator. The following data were recorded: M of EDTA = 0.05204 M =D41.97 mL = 15.16 mL How many mmoles of Zn and Ni were present in the solution ? If the weight of the chip is V of EDTA for ZN2+ V of EDTA for Ni2+ 1.000 g, give the % Zn and % Ni in the original sample. -54-
Transcribed Image Text:XERCISE IV- 3. 50.00mL of a solution containing both Ni2* and Pb2+ ions requires 46.32 mL of a 0.02041M EDTA solution for titration of both metals. A second 50.00 mL aliquot is treated with KCN to mask the nickel and then titrated with 30.28 mL of the same EDTA solution. Calculate the molarities of the Ni2 and Pb2+ ions. 2. A 0.5745 g sample of an alloy containing principally bismuth and lead is dissolved in nitric acid and diluted to 250.0 mL in a volumetric flask. A 50.00 mL aliquot is withdrawn, the pH adjusted to 1.5, and the bismuth titrated with 30.26 mL of 0.01024 M EDTA. The pH of the solution is then increased to 5.0 and the lead titrated with 20.42 mL of the same EDTA solution. Calculate the percentages of lead and bismuth in the alloy. 3. A standard solution of EDTA is prepared, and by titration each mL is found to complex with the Mg in 10.0 mL of a solution containing 0.300 g of MgCl2 per liter. A 100 mL pipetful of a certain well water is found to require 8.60 mL of the standard EDTA. With the knowledge that the conventional method of expressing water hardness in terms of ppm of CaCO3 regardless of the nature of the cations and anions actually present, what is the hardness of the well water? 4. A 60.00 mL of buffered solution (pH 10) containing Zn and Nit ions (from a chip sample) is analyzed using EDTA titration with EBT as indicator. The following data were recorded: M of EDTA = 0.05204 M =D41.97 mL = 15.16 mL How many mmoles of Zn and Ni were present in the solution ? If the weight of the chip is V of EDTA for ZN2+ V of EDTA for Ni2+ 1.000 g, give the % Zn and % Ni in the original sample. -54-
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