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the percentage purity of the potassium cyanide.

the percentage purity of the potassium cyanide.

Chemistry
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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1 Solutions of cyanide salts are still widely used in the extraction of gold metal from its ores. It is therefore necessary to regularly monitor the quality of the reagents used to make such solutions. The purity of a sample of solid potassium cyanide is determined as follows: 5.00 g of the impure potassium cyanide is weighed off, and quantitatively transferred into a 100.00 mL volumetric flask, dissolved and made up to the mark. A 10.00 mL portion of this solution is pipetted into a conical flask, and titrated with a 0.200 M KMNO4 solution. The endpoint of the titration is determined when the colourless solution in the conical flask turns a bright pink due to the presence of excess permanganate ions. The average titration value is 20.69 mL of the KMNO4 solution. The reaction stoichiometry is as follows: 2KMN04(aq) + 3KCN(aq) + H20({) → 2MnO2(s) + 3КОCN(aq) + 2KОН (аq) 1.1 Determine the percentage purity of the potassium cyanide.
Transcribed Image Text:1 Solutions of cyanide salts are still widely used in the extraction of gold metal from its ores. It is therefore necessary to regularly monitor the quality of the reagents used to make such solutions. The purity of a sample of solid potassium cyanide is determined as follows: 5.00 g of the impure potassium cyanide is weighed off, and quantitatively transferred into a 100.00 mL volumetric flask, dissolved and made up to the mark. A 10.00 mL portion of this solution is pipetted into a conical flask, and titrated with a 0.200 M KMNO4 solution. The endpoint of the titration is determined when the colourless solution in the conical flask turns a bright pink due to the presence of excess permanganate ions. The average titration value is 20.69 mL of the KMNO4 solution. The reaction stoichiometry is as follows: 2KMN04(aq) + 3KCN(aq) + H20({) → 2MnO2(s) + 3КОCN(aq) + 2KОН (аq) 1.1 Determine the percentage purity of the potassium cyanide.
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