CAS CH 131 Study Guide - Midterm Guide: Freezing-Point Depression, Mole Fraction, Boiling-Point Elevation

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Molarity- moles of solute / volume of solvent (l) Molality- moles of solute / mass of solvent (kg) 0. 3 l * 0. 5 m = 0. 15 moles mgcl2. 3 ions * 0. 15 moles = 0. 45 moles of free ions. 1. 1 l * 1 m = 0. 1 moles additional. 0. 15 moles + 0. 1 additional moles = 0. 25 moles. 300 ml + 100 ml = 400 ml or . 4 l. 0. 25 moles / 0. 4 l = 0. 625 m. 100 ml * 0. 731 g*ml-1 = 71. 3 g = 0. 0713 kg of diethyl ether. 0. 2 moles of solute / 0. 0713 kg = Which can occur in aq. acidic or basic solutions. Ch4 + 2 o2 -> co2 + 2 h2o. Ions with multiple charges usually give insoluble ions (ppt in solution) Ions with single charges usually give soluble ions in solution. Bacl2 (aq) + k2so4 (aq) -> baso4 (s) + 2 kcl(aq)

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