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Cyanide ion, CN, is important in metal plating industries because it can keep metals dissolved under conditions where they would otherwise form solids (precipitate) and settle out of solution. It is important to maintain pH > 10.5 in these solutions to minimize the release of toxic hydrogen cyanide gas. (a) If a solution is prepared by dissolving 10-2 M NaCN in water, will the pH be in the region where the solution is safe? (b) What is the HCN concentration in the solution?

Cyanide ion, CN, is important in metal plating industries because it can keep metals dissolved under conditions where they would otherwise form solids (precipitate) and settle out of solution. It is important to maintain pH > 10.5 in these solutions to minimize the release of toxic hydrogen cyanide gas. (a) If a solution is prepared by dissolving 10-2 M NaCN in water, will the pH be in the region where the solution is safe? (b) What is the HCN concentration in the solution?

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
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Analyzing pH & finding a concentration of a species in solution. 

### The Role of Cyanide Ion in Metal Plating Cyanide ion, \(\text{CN}^-\), plays a crucial role in the metal plating industry by keeping metals dissolved under conditions that would normally cause them to precipitate and settle out of solution. Maintaining a pH greater than 10.5 in these solutions is essential to minimizing the release of toxic hydrogen cyanide gas. #### Discussion Points: (a) **Solution Safety through pH Regulation:** If a solution is prepared by dissolving \(10^{-2} \, \text{M} \) sodium cyanide (\(\text{NaCN}\)) in water, we need to determine if the resulting pH ensures the solution resides in a safe region. (b) **HCN Concentration Calculation:** Determine the concentration of hydrogen cyanide (\(\text{HCN}\)) in the solution to assess safety and compliance with handling standards. This understanding is critical for ensuring safety and effectiveness in metal plating applications.
Transcribed Image Text:### The Role of Cyanide Ion in Metal Plating Cyanide ion, \(\text{CN}^-\), plays a crucial role in the metal plating industry by keeping metals dissolved under conditions that would normally cause them to precipitate and settle out of solution. Maintaining a pH greater than 10.5 in these solutions is essential to minimizing the release of toxic hydrogen cyanide gas. #### Discussion Points: (a) **Solution Safety through pH Regulation:** If a solution is prepared by dissolving \(10^{-2} \, \text{M} \) sodium cyanide (\(\text{NaCN}\)) in water, we need to determine if the resulting pH ensures the solution resides in a safe region. (b) **HCN Concentration Calculation:** Determine the concentration of hydrogen cyanide (\(\text{HCN}\)) in the solution to assess safety and compliance with handling standards. This understanding is critical for ensuring safety and effectiveness in metal plating applications.
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