APFIVE Redox Titration of a Copper Alloy
A 0.250 g sample of a copper-zinc alloy is dissolved in acid and treated with excess KI. This reaction converts Cu²⁺ ions to CuI and liberates I₂. The liberated I₂ is then titrated with 28.5 mL of 0.100 M Na₂S₂O₃. What is the mass percentage of copper in the alloy?
A
72.3%
B
64.8%
C
27.7%
D
36.2%
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