Chemistry 1211 Tuesday (10.09.18) 1) The osmotic pressure in blood plasma is 7.6 atm. You want to make an isotonic saline solution to administer to a patient. How many grams of sodium chloride do you need to add to 1.5 L of water to make this solution? The temperature of the solution is 25 degrees C. = MRT (osmotic pressure equation)Π R= .08206 T= temperature in Kelvin M= molarity solute ( )L of solutionmoles of solute = (.08206) (25 + 273.15) M.67 M = 0.3106 moles/ L 0.3106 = 1.5 Lx moles 0.4659 moles x 1 mole35.45 + 22.99 (grams NaCl) = about 27 2) What would happen if you accidentally drank too much ocean water? Too much water would leave the cells they would shrivel 3) What is true about electrolytes? Molecular compounds can be strong or weak electrolytes Strong electrolytes dissociate fully When electrolytes dissolve, there are more particles in solution than when nonelectrolytes dissolve Electrolytes lower vapor pressure more than nonelectrolytes at the same concentration4) The Van’t Hoff factor tells how many particles a solute will break into when dissolved. Many ionic compounds have Van’t Hoff factors less than expected because they don’t fully dissociate. Which compound will have a Van’t Hoff factor that is closest to the expected value? Ca (7.10x ) (in the list of answers you chose the one with the highest ksp value becauseSO4105 you look at how soluble it is) 5) Which vitamins are fat soluble? Those that are carbon chains 6) A runner passed out after a long marathon. Medical tests showed that blood serum sodium levels were low and total body water was elevated. Urinary sodium levels were greater than normal. What most likely caused the runner to pass out? Drinking too much
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