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If the density of some lake water is 1.2...

If the density of some lake water is 1.2.5 g `mL^(-1)` and contains 92 g of `Na^(+)` ions per kg of water, calculate the molality of `Na^(+)` ions in the lake.

Text Solution

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No. of moles of `Na^(+)` ion
`= ("mass")/("molar Mass")`
`= (92 g)/(23g "mol"^(-2))`
= 4 mol
Molarity of `Na^(+)` ions = `("No. of moles of "Na^(+) ions)/("Mass of water in kg ")`
= `(4 " mol ")/(1 kg )`
` = 4 " mol " kg^(-1) = 4 `m.
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