A 1.00 L aqueous magnesium chloride solution has an osmotic pressure of 15.4 atm at 25 $\degree$C.How many grams of MgCl₂ (95.21 g/mol) were required to make this solution?

Question

Quizplus · Accepted Answer

The osmotic pressure (π) is given by the formula π = iMRT, where i is the van't Hoff factor (3 for MgCl2), M is the molarity, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin (298 K for 25°C). Solving for M and then using the molar mass of MgCl2, we find that approximately 20.0 grams of MgCl2 are needed.

A 100 L Aqueous Magnesium Chloride Solution Has an Osmotic Pressure