Magnesium citrate, Mg3(C6H5O7)2, belongs to a class of laxatives called hyperosm

Question

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 30.0g of magnesium citrate in 238mL of solution at 37 ?C (approximate body temperature). Assume complete dissociation of the ionic compound.

Explanation / Answer

moles = 30.0 / 450 g/mol= 1/15
osmotic pressure = 5 x 0.0821 x 310 K / (0.238 x 15) L = 35.6 atm

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