Question

Chemistry 107 Problem Solving Handout #13 NameloMAS hoME2 1. Calculate the mass (m/m) percent of sodium iodide in solution prepared by dissolving 6.43 g of Nal in 85.0 g HO. How many grams of solute are dissolved in 35.0 g of 2.00 % ( m/m ) NaCl solution? 2. What is the volume (v/v) percent water in a solution containing 257 mL of ethyl alcohol and enough water to give a total volume of 325 mL? 3. 4. Determine how many grams of sodium phosphate would be needed to prepare 455 mL of a 2.50% (m/v) sodium phosphate solution. Calculate the concentration, as mass-volume percent cesium chloride (CSCI), for a solution prepared by adding 5.0 g of CsCI to 20.0g of H2O to give a solution with a density of 1.18 g/mL. 5. 6. What is the concentration, in ppm (m/m), of a sodium chloride solution prepared by adding 37.5 Hg of sodium chloride to 21.0 kg of water?

Answer 1

we know that mass percent ( m al m7 weight of solute -X100 weight of solution From the data mass of solute = NaI = 6.439 mass of solution = (6-439+85g) = 91.439 -hoc ma sg percent - 6.439 x 100 - 41.439 = 7:03 - mass percent = 7.03 % Given Nach solution mass = 359 mais percent = 2% .. mass of solute (Naci) = mass percent x mass of sola loo mass of solute; 2 x 359 -=0.79 loo 0.79 of Nach dissolved in 35g of solution