1 a How many mL of a 0 2350 M Ni NO3 2 aq solution should be used to make 500 0 mL of a 0 1000 CH 201 Self Study Worksheet 2 0 1000 M 500 0 mL 212 8 mL 0 2350 M b If a 0 1763 M solution of Ni NO3 2 has an absorbance of 0 0721 calculate the absorbance that a 0 2350 M solution would have at the same wavelength and in the same cuvette assuming the x and y intercepts are 0 0 Beer s Law A lC A2 C2 0 0721 0 1763 M A2 0 2350 M A2 0 0961 M solution M2V2 M1 V1 A1 C1 2 a What is the hydroxide concentration OH of a solution prepared by mixing 12 3 mL of 1 05 M Ca OH 2 aq 33 7 mL of 0 87 M NaOH and 40 0 mL of water 12 3 mL 1 05 mmol Ca OH 2 33 7 mL 0 87 mmol NaOH mL mL 2 mmol OH 1 mmol Ca OH 2 1 mmol OH 1 mmol NaOH 25 83 mmol OH 29 31 mmol OH total mmoles OH 25 83 29 31 55 15 mmol OH total volume 12 3 mL 33 7 mL 40 0 mL 86 0 mL M total mmoles total volume 55 15 mmol 86 0 mL 0 641 M OH b What is the calcium concentration Ca2 in the resulting solution 12 3 mL 1 05 mmol Ca OH 2 mL 1 mmol Ca OH 2 1 mmol Ca2 12 92 mmol Ca2 M mmoles total volume 12 92 mmol 86 0 mL 0 150 M Ca2 3 a First write the net balanced reaction when a solution of Pb NO3 2 reactions with NaCl Complete the following reaction table in mmol for 30 0 mL of 0 123 M Pb NO3 2 aq with 20 0 mL of 0 625 M NaCl aq aq aq cation s ionic compound 0 00 3 69 3 69 Initial Final 3 69 3 69 0 00 b How many grams of ionic compound s are formed 3 69 mmol 278 mg PbCl2 mmol 1 g 1000 mg 1 03 g PbCl2 s c What molarity of anion aq is left after the reaction 5 12 mmol 50 0 mL 0 102 M Cl anion 12 5 7 38 5 12 4 a How many grams of Cu NO3 2 s are needed to make 0 500 L of 0 200 M solution CH 201 Self Study Worksheet 2 0 200 mol Cu NO3 2 L solution 0 500 L solution 187 6 g Cu NO3 2 mol Cu NO3 2 18 76 g Cu NO3 2 b What is the molality of this solution d 1 001 g mL 1 001 g solution mL solution 500 mL solution 500 5 g solution 18 76 g solute 481 74 g solvent 0 48174 kg solvent m mol solute kg solvent 0 100 moles Cu NO3 2 0 4817 kg solvent 0 2076 m 500 5 g solution c What is the colligative molality mc i m 3 0 2076 m 0 6228 m Cu NO3 2 d What is the freezing point of the resulting solution For water kf 1 86 C m Tf kf mc 1 86 C m 0 6228 m 1 158 C FP 0 00 C 1 158 C 1 158 C 5 The vapor pressure of an aqueous solution of glucose C6H12O6 MW 180 16 g mol at 25 C was found to be 23 17 torr vapor pressure of pure water at 25 C P 23 76 torr a What is the mole fraction of glucose in the solution Psolution XsolventP solvent Xsolvent Psolution P solvent 23 17 torr 23 76 torr 0 975 Xsolute 1 Xsolvent 0 025 b What is the molality m of the solution Xsolute 0 025 out of 1 total mole 0 025 mol are solute and 0 975 moles are solvent 0 975 mol solvent x 18 g mol water 17 55 g water M 0 025 mol solute 0 01755 kg solvent 1 424 m 6 A solution contains 1 00 g of hemoglobin dissolved in enough water to form 100 cm3 of solution The osmotic pressure at 20 C is found to be 2 75 mm Hg R 0 08206 Latm molK 8 314 J molK 760 mm Hg 760 torr 1 atm 1 cm3 1 mL a What is the molarity of hemoglobin M RT 2 75 mm Hg 760 mm Hg atm b What is the molar mass of hemoglobin mol K 0 0821 Latm 293 K 1 50 10 4 M M 1 50 10 4 mol MW 1 00 g 1 50 10 5 mol 6 65 104 g mol 100 mL L solution 1 L 103 mL 1 50 10 5 moles hemoglobin
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