CHEMISTRY HELP PLEASE?
Magnesium citrate, Mg3(C6H5O7)2, belongs to a class of laxatives called hyperosmotics, which are used for rapid emptying of the bowel. When a concentrated solution of magnesium citrate is consumed, it passes through the intestines, drawing water and promoting diarrhea, usually within 6 hours.
Calculate the osmotic pressure of a magnesium citrate laxative solution containing 27.0 g of magnesium citrate in 252 mL of solution at 37 ∘C (approximate body temperature). Assume complete dissociation of the ionic compound.
- ChemTeamLv 74 weeks ago
π = i M R T
Calculate the molarity:
(M) (0.252 L) = 27.0 g / 451.112 g/mol
M = 0.23751 mol/L
π = (5) (0.23751 mol/L) (0.08206 L atm / mol K) (310 K)
π = 30.2 atm
The 5 for the van 't Hoff factor comes from here:
Mg3(C6H5O7)2 ---> 3Mg^2+(aq) + 2C6H5O7^3-(aq)
Each Mg3(C6H5O7)2 that dissolves yield 5 ions in solution.