L2 - Concentration a..

Practice Problems:1.Prepare 250 mL of 0.10 M HCl fromconcentrated HCl (12 M).2.A student needs 125g Cl - . Whatvolume of concentrated hydrochloricacid is needed to contain therequired chlorine?Molality (m)Because both moles and mass donot change with temperature,molality (unlike molarity) is nottemperature dependent.m =mol of solutekg of solventPractice Problem:1. A solution is prepared by mixing1.00 g ethanol with 100.0 g water togive a final volume of 101 mL.Calculate the molarity and molalityof the solution.4