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Answer 1 · 2018-01-05T17:07:26

The osmolar concentration of the solution is 1 Osmol/L.

An osmole (Osmol) is 1 mol of particles that contribute to the osmotic pressure of a solution.

For example

$"CaCl"_2"(s)" → "Ca"^"2+""(aq)" + "2Cl"^"-""(aq)"$
$color(white)(ll)"1 mol"color(white)(mmmll)"1 mol"color(white)(mmm)"2 mol"$

Thus,

$"1 mol CaCl"_2 ≡ "3 Osmol"$

Sodium lactate ( $"NaLac"$ ) is the sodium salt of lactic acid.

It ionizes in solution according to the equation

$"NaLac(s)" → "Na"^"+""(aq)" + "Lac"^"-""(aq)" +$

Thus,

$"1 mol NaLac ≡ 2 Osmol"$

∴ $(0.5 color(red)(cancel(color(black)("mol NaLac"))))/"1 L" × ("2 Osmol")/(1 color(red)(cancel(color(black)("mol NaLac")))) = "1 Osmol/L"$