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title: "A student analyzes the purity of a solid mixture containing \\(\\text{NaCl}\\) and an inert, water-soluble non-chloride impurity. The student dissolves a \\(2.00 \\text{ g}\\) sample of the mixture completely in distilled water and adds an excess of \\(1.0 \\text{ M } \\text{AgNO}_3\\text{(aq)}\\), precipitating all chloride ions as \\(\\text{AgCl(s)}\\). The precipitate is filtered, washed, and dried to a constant mass of \\(1.43 \\text{ g}\\). Given that the molar mass of \\(\\text{AgCl}\\) is \\(143.4 \\text{ g/mol}\\) and the molar mass of \\(\\text{NaCl}\\) is \\(58.4 \\text{ g/mol}\\), what is the percent by mass of \\(\\text{NaCl}\\) in the original sample?"
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url: "https://nerd-notes.com/ubq/119622/"
date_modified: "2026-08-21T08:11:49+00:00"
---

# A student analyzes the purity of a solid mixture containing \(\text{NaCl}\) and an inert, water-soluble non-chloride impurity. The student dissolves a \(2.00 \text{ g}\) sample of the mixture completely in distilled water and adds an excess of \(1.0 \text{ M } \text{AgNO}_3\text{(aq)}\), precipitating all chloride ions as \(\text{AgCl(s)}\). The precipitate is filtered, washed, and dried to a constant mass of \(1.43 \text{ g}\). Given that the molar mass of \(\text{AgCl}\) is \(143.4 \text{ g/mol}\) and the molar mass of \(\text{NaCl}\) is \(58.4 \text{ g/mol}\), what is the percent by mass of \(\text{NaCl}\) in the original sample?

A student analyzes the purity of a solid mixture containing \(\text{NaCl}\) and an inert, water-soluble non-chloride impurity. The student dissolves a \(2.00 \text{ g}\) sample of the mixture completely in distilled water and adds an excess of \(1.0 \text{ M } \text{AgNO}_3\text{(aq)}\), precipitating all chloride ions as \(\text{AgCl(s)}\). The precipitate is filtered, washed, and dried to a constant mass of \(1.43 \text{ g}\). Given that the molar mass of \(\text{AgCl}\) is \(143.4 \text{ g/mol}\) and the molar mass of \(\text{NaCl}\) is \(58.4 \text{ g/mol}\), what is the percent by mass of \(\text{NaCl}\) in the original sample?

- **A.** \(29.2\%\)
- **B.** \(35.5\%\)
- **C.** \(58.4\%\)
- **D.** \(71.5\%\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119622/*