12 14 2016 RWW04 Dilutions Determining Concentrations Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren WebAssign RWW04 Dilutions Determining Concentrations Homework Current Score 100 Due Friday September 9 2016 11 59 PM EDT The due date for this assignment is past Your work can be viewed below but no changes can be made 1 11 points How many L of 2 90 M HCl are required to react completely with 20 0 g of Al OH 3 Al OH 3 3HCl AlCl3 3H2O No Response 0 265 L HCl 2 22 points Complete a reaction table in millimoles for the reaction of 33 3 mL of 0 7700 M Ag1 and 69 4 mL of 1 1700 M CrO42 2Ag1 initial No Response delta final 25 64 No Response No Response 81 20 No Response 25 64 No Response Ag2CrO4 CrO42 12 82 0 00 No Response 68 38 No Response 0 mmol No Response 12 82 mmol No Response 12 82 mmol What mass in grams of Ag2CrO4 forms No Response 4 252 g What is the molar concentration of the remaining excess reactant Assume that the volumes are additive No Response 0 6658 M 3 11 points A 0 6870 g sample of impure Ca OH 2 is dissolved in enough water to make 32 90 mL of solution 20 00 mL of the resulting solution is then titrated with 0 1928 M HCl What is the percent purity of the calcium hydroxide if the titration requires 43 26 mL of the acid to reach the endpoint No Response 73 99 http www webassign net web Student Assignment Responses view key dep 14314085 1 3 12 14 2016 RWW04 Dilutions Determining Concentrations 4 11 points If a 0 320 mM solution of MnO41 has an absorbance of 0 480 at 525 nm in a 1 000 cm cell What is the concentration of a MnO41 solution that has absorbance of 0 200 in the same cell at that wavelength MnO41 No Response 0 133 mM 5 11 points The following successive dilutions are applied to a stock solution that is 4 80 M sucrose Solution A 33 0 mL of the stock sollution is diluted to 283 mL Solution B 226 4 mL of Solution A is diluted to 306 mL Solution C 184 0 mL of Solution B is diluted to 424 mL What is the concentration of sucrose in solution C No Response 0 1797 M 6 12 points What is the iodide ion concentration in a solution if the addition of an excess of 0 100 M Pb NO3 2 to 34 3 mL of the solution produces 416 1 mg of PbI2 I1 No Response 0 0526 M 7 11 points All of the iron in 1 623 g of an iron sample is converted into Fe2 which was then titrated with dichromate 14H1 Cr2O72 6Fe2 6Fe3 2Cr3 7H2O What is the mass percent iron in the sample if 36 31 mL of 0 07978 M K2Cr2O7 were required to reach the equivalence point No Response 59 81 Fe http www webassign net web Student Assignment Responses view key dep 14314085 2 3 12 14 2016 RWW04 Dilutions Determining Concentrations 8 11 points The concentration of HCl in a bottle was determined as follows 3 00 mL of the acid were diluted to 250 00 mL 60 03 mL of the diluted acid were titrated with 0 08074 M NaOH 42 20 mL of the base were required to reach the end point What is the HCl concentration in the bottle No Response 4 73 M http www webassign net web Student Assignment Responses view key dep 14314085 3 3
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