# Chem 112

 As temperature increases, solubility ______ for solids but _______ for gas. Increases, decreases A colligative property is a physical property that is dependent on ________ ? The # of solute particles but not their identity As # of particles increases, vapor pressure ______. Reduces As # of particles increases, freezing point _______. Decreases As # of particles increases, boiling point ______. Increases Vapor Pressure ________ Reduction Boiling Point _______ Elevation Freezing Point _______ Depression What is the van't Hoff factor? i = the # of particles the substance breaks into As # of particles increase, osmosis pressure _______. Increases How many particles does 2m NaCl have? 4NaCl -> Na + Cl2 particles X 2m = 4 How many particles does 2m CH3COOH have? Weak electrolyte so partially dissociates into ions.1 < i < 2 2-4 particles All non-electrolytes have what van't Hoff factor? i = 1 In an equation, use the van't Hoff factor for the ______ & the constant for the ________. Solute, Solvent In an equation, when do u worry about the van't Hoff factor? When the solute is a strong or weak electrolyte How do u find the change in temperature of boiling point? Constant of solvent X van't Hoff factor (if necessary) X molality After finding the change of boiling temp, how do u find the temperature of the solution? Take ur change in temp & add it to the boiling of solvent (in celsius)E.G. Change in temp is .34 so add that to 100 (water's boiling point) = 100.34 C How do u find the temperature change in freezing point? Constant of freezing solvent X van't Hoff factor (if necessary) X molality After finding the change in freezing temp, how do u find the freezing point for the solution? Subtract the change in freezing temp from the freezing point of the solvent.E.G. Change in temp is 1.23 so subtract that from 0 (water's freezing point) =-1.23 C What is Raoult's Law? (Vapor Pressure) Pa = Xa (Pure a)Solution's vapor pressure = mole fraction X pure solvent's vapor pressure Authortessaj21 ID36897 Card SetChem 112 DescriptionPhysical & Colligative properties E.G. Vapor pressure, boiling point, etc... Updated2010-09-23T19:34:10Z Show Answers