Question

1) At physiological temperature (37^OC) the osmotic pressure of blood is 7.65 atm. What concentration (% W/V) of potassium chloride (KCl, MW = 74.5) solution has the same osmotic pressure of blood? Assume the specific gravity of the solution is 1.

2)An ophthalmic (eye drop) formulation contains 100 mEq of sodium chloride (molecular weight = 58.5 g/mole). Calculate the amount (in grams) of sodium chloride needed for the formulation.

3)Methanol (CH₃OH, MW = 32) is a nonelectrolyte. What is the amount (in grams) of methanol that must be added to 600 ml of water to produce a boiling point elevation of 0.15^OC? The K_b value for water is 0.51 (degree-kg/mole).

4)What is the boiling point (^OC) of aqueous solution containing 10 grams of sodium phosphate (Na₃PO₄, MW = 164) dissolved in 500 ml of water? The K_b value for water is 0.51 (degree-kg/mole).

5)Calculate the molality (m) of a solution of sodium dihydrogen phosphate (NaH₂PO₄, MW = 120) that is prepared by dissolving 15 g of sodium dihydrogen phosphate in 700 mL of water (density of the solution is 1.06).

Answer 1