Question

If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution? If there is 0.2 M glucose along with 0.15 M NaCl in solution, what is the osmolarity of this solution? 1. 500 mOsm 2. 2.15 Osm 3. 350 mOsm 4. 2.30 Osm 5. 300 mOsm

Answer 1

Answer:

Option 5. 300 mOsm

Explanation:

Osmolarity is the sum of the concentrations of all molecular species that are "swimming" in a solvent. In this case there are two species because the water dissociates sodium chloride in Na + and Cl-. Therefore for each NaCl we will have two independent molecules. Glucose does not dissociate, so osmolarity would not be affected.

NaCl →  Na⁺  +  Cl⁻

0.15 M we have 0.15 moles/L . 2 = 0.30 Osm

As we have a value of 0.30 Osm, if we convert it to mOsm

0.30 Osm . 1000 mOsm /  1Osm = 300 mOsm