Redox Reactions and Volumetric AnalysishardCOMPREHENSIVE

**Passage 11:** A g sample of a silver alloy was dissolved in and the ions were titrated with using Redox Reactions and Volumetric Analysis Chemistry Question

Question

**Passage 11:** A $2.0$ g sample of a silver alloy was dissolved in $HNO_3$ and the $Ag^+$ ions were titrated with $0.1 M$ $KSCN$ using $Fe^{3+}$ as indicator (Volhard's method). The titration required $25$ mL of $KSCN$ to reach the brick-red endpoint. <br> **Q1:** The reaction occurring during titration is:

Answer: C

💡 Solution & Explanation

**Logic:** The primary reaction is the precipitation of white $AgSCN$. Once all $Ag^+$ is consumed, the first excess drop of $SCN^-$ reacts with the indicator $Fe^{3+}$ to form the blood-red complex $[Fe(SCN)]^{2+}$, marking the endpoint.

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