LECTURE 6: CONCENTRATION- REVIEW Concentration • Molality Review Molality Molality (symbolized by m) is the number of moles of solute per kilogram of solvent. Molality is used in thermodynamic calculations where a temperature independent unit of concentration is needed Calculate the molality of HCl in a solution of hydrochloric acid in water, containing 30% HCl by weight The mole fraction of glucose in aqeous solution is 0.2, then molality of solution is? A solution of sodium carbonate is prepared by dissolving 0.212g of Na2CO3 and diluting to 100ml. Calculate the normality of the solution a. If it is used as a monoacidic base b. If it is used as a diacidic base I2 is an oxidizing agent that in reactions with reducing agents is reduced to iodide ion (I-). How many grams of I2 would you weigh out to make 0.100 N I2 solution. Commercially available concentrated hydrochloric acid is 37.0% w/w HCl. Its density is 1.18 g/mL. Using this information calculate (a) the molarity of concentrated HCl, (b) the mass and volume (in milliliters) of solution containing 0.315 mol of HCl. The density of concentrated ammonia, which is 28.0% w/w NH3, is 0.899 g/mL. What volume of this reagent should be diluted to 1.0 × 103 mL to make a solution that is 0.036 M in NH3? NEXT LECTURE