Solutions Calculations Practice Problems Molarity Practice Problems: ● How many g of potassium carbonate are needed to make 200mL of a 2.5M solution? ● How many liters of 4M solution can be made using 100 g of lithium bromide? ● What is the molarity of an aqueous solution with volume of 450mL that contains 200g of iron (II) chloride? ● How many grams of copper (II) fluoride are needed to make 6.7 L of a 1.2 M solution? ● What is the concentration of a solution with a volume of 2.5 Liters containing 660g of calcium phosphate? Molality Practice Problems: ● A sulfuric acid solution containing 571.4 g of H2SO4 per liter of solution has a density of 1.329 g/mL. Calculate the molality of H2SO4 in this solution ● Calculate the molality of 15.00 M HCl with a density of 1.0745 g/cm3 ● What is the mass of a sample of a 0.449 molal KBr that contains 2.92 kg of water? ● Calculate the mass of the solute C6H6 and the mass of the solvent tetrahydrofuran that should be added to prepare 1.63 kg of a solution that is 1.42 m. ● What is the molality of a 3.75 M H2SO4 solution with a density of 1.230 g/mL? Mole Fraction, Mass Percent, and Volume Percent Practice Problems: ● What is the mass percent of a solution made by adding 21.4g of NaCl to 135.0g of H2O ● What is the volume percent of a solution made by adding 38.2mL of ethanol to enough water to make a 250.0mL solution ● 0.100 mole of NaCl is dissolved into 100.0 grams of pure H2O. What is the mole fraction of NaCl? ● A solution is prepared by mixing 25.0 g of water, H2O, and 25.0 g of ethanol, C2H5OH. Determine the mole fractions of each substance. ● How many grams of water must be used to dissolve 100.0 grams of sucrose (C12H22O11) to prepare a 0.020 mole fraction of sucrose in the solution? Dilution Problems: ● If you dilute 175 mL of a 1.6 M solution of LiCl to 1.0 L, determine the new concentration of the solution. ● You need to make 10.0 L of 1.2 M KNO3. What molarity would the potassium nitrate solution need to be if you were to use only 2.5 L of it? ● How many milliliters of 5.0 M copper(II) sulfate solution must be added to 160 mL of water to achieve a 0.30 M copper(II) sulfate solution? ● To what volume should you dilute 133 mL of an 7.90 M CuCl2 solution so that 51.5 mL of the diluted solution contains 4.49 g CuCl2? ● 1.00 L of a solution is prepared by dissolving 125.6 g of NaF in it. If I took 180 mL of that solution and diluted it to 500 mL, determine the molarity of the resulting solution.