**Passage 6:** The **Silver Salt Method** is used to determine the molecular mass of organic acids. — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Passage 6:** The **Silver Salt Method** is used to determine the molecular mass of organic acids. An organic acid is converted to its silver salt ($R-COOAg$), which is then ignited to yield pure metallic silver. A $0.66\text{ g}$ sample of the silver salt of a dibasic organic acid left a residue of $0.432\text{ g}$ of silver on ignition. What is the molecular mass of the silver salt?
Answer: A
💡 Solution & Explanation
$\text{moles Ag} = 0.432 / 108 = 0.004 \text{ mol}$. <br>Since the acid is dibasic, the salt is $Ag_2A$. <br>$\text{moles salt} = 0.004 / 2 = 0.002 \text{ mol}$. <br>$MW_{salt} = 0.66 / 0.002 = 330 \text{ g/mol}$.
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