(AIEEE 2010) of sodium carbonate, is dissolved in enough water to make of solution. If sodium carbon — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
(AIEEE 2010) $25.3 \text{ g}$ of sodium carbonate, $Na_2CO_3$ is dissolved in enough water to make $250 \text{ mL}$ of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $Na^+$ and carbonate ions, $CO_3^{2-}$ are respectively: (Molar mass of $Na_2CO_3 = 106 \text{ g mol}^{-1}$)
Answer: B
💡 Solution & Explanation
Moles $Na_2CO_3 = 25.3 / 106 \approx 0.2387$. <br>Molarity $[Na_2CO_3] = 0.2387 / 0.25 = 0.9548 \text{ M}$. <br>$[Na^+] = 2 \times 0.9548 = 1.9096 \text{ M}$; $[CO_3^{2-}] = 0.9548 \text{ M}$. [1, 6]
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