Q 2.26 If the density of some lake water is 1.25g mL^–1 and contains 92 g of Na+ ions per kg of water, calculate the molarity of Na+ ions in the lake.

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Vishal Baghel | Contributor-Level 10

8 months ago

Mass of ions = 92g

Molar mass of ions = Na⁺ = 23g (neglect the mass lost due to absence of a electron)

Moles of ions = mass of ions/molar mass

⇒ n = 92/23 moles

⇒ n = 4moles

Molality of solution = moles of solute/mass of solvent (in kg) Molality = 4/1 = 4M

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