Question

Question #024f2

Answer 1

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

Explanation:

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"`