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Friday, June 5, 2015

Volumetric Analysis Problems, 10

Category: Chemical Engineering Math

"Published in Newark, California, USA"

A 750.25 mg alloy of nickel was dissolved and treated to remove the impurities. The ammonium solution was treated with 50 mL of 0.1075 M KCN and the excess cyanide required 2.25 mL of 0.00925 M AgNO3. Determine the % Ni in the alloy.

Solution:

If nickel is dissolved in ammonium solution, then nickel is converted into nickel ion in order to remove the impurities. If KCN solution is added to nickel solution, then the chemical reaction is



From the chemical reaction above, we can solve for the weight of nickel as follows
 
 
 
 
 
 

Therefore, the percent of nickel in the alloy is