12/14/2016 RWW04 Dilutions & Determining Concentrationshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314085 1/3Current Score : – / 100 Due : Friday, September 9 2016 11:59 PM EDT1. –/11 pointsHow 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) 0.265L HCl2. –/22 pointsComplete a reaction table in millimoles for the reaction of 33.3 mL of 0.7700 M Ag1+ and 69.4 mL of1.1700 M CrO42.2Ag1++CrO42Ag2CrO4initial (No Response) 25.64 (No Response) 81.20 (No Response) 0 mmoldelta(No Response) 25.64(No Response) 12.82(No Response) 12.82 mmolfinal (No Response) 0.00 (No Response) 68.38 (No Response) 12.82 mmolWhat mass in grams of Ag2CrO4 forms?(No Response) 4.252 gWhat is the molar concentration of the remaining excess reactant? Assume that the volumes areadditive.(No Response) 0.6658 M3. –/11 pointsA 0.6870g sample of impure Ca(OH)2 is dissolved in enough water to make 32.90 mL of solution. 20.00mL of the resulting solution is then titrated with 0.1928M HCl. What is the percent purity of the calciumhydroxide if the titration requires 43.26 mL of the acid to reach the endpoint?(No Response) 73.99 %RWW04 Dilution s & Determining Concentrat ions (Homework)Paddy SheehanCH 201, section 002, Fall 2016Instructor: Robert WarrenWebAssignThe due date for this assignment is past. Your work can be viewed below, but no changes can be made.12/14/2016 RWW04 Dilutions & Determining Concentrationshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314085 2/34. –/11 pointsIf a 0.320 mM solution of MnO41 has an absorbance of 0.480 at 525 nm in a 1.000 cm cell. What is theconcentration of a MnO41 solution that has absorbance of 0.200 in the same cell at that wavelength?[MnO41 ] = (No Response) 0.133 mM5. –/11 pointsThe following successive dilutions are applied to a stock solution that is 4.80 M sucroseSolution A = 33.0 mL of the stock sollution is diluted to 283 mLSolution B = 226.4 mL of Solution A is diluted to 306 mLSolution C = 184.0 mL of Solution B is diluted to 424 mLWhat is the concentration of sucrose in solution C?(No Response) 0.1797 M6. –/12 pointsWhat is the iodide ion concentration in a solution if the addition of an excess of 0.100 M Pb(NO3)2 to34.3 mL of the solution produces 416.1 mg of PbI2?[I1] = (No Response) 0.0526 M7. –/11 pointsAll of the iron in 1.623 g of an iron sample is converted into Fe2+, which was then titrated withdichromate:14H1+ + Cr2O72 + 6Fe2+ > 6Fe3+ + 2Cr3+ + 7H2OWhat is the mass percent iron in the sample if 36.31 mL of 0.07978 M K2Cr2O7 were required to reachthe equivalence point?(No Response) 59.81 % Fe12/14/2016 RWW04 Dilutions & Determining Concentrationshttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314085 3/38. –/11 pointsThe concentration of HCl in a bottle was determined as follows:3.00 mL of the acid were diluted to 250.00 mL60.03 mL of the diluted acid were titrated with 0.08074M NaOH42.20 mL of the base were required to reach the end pointWhat is the HCl concentration in the bottle?(No Response) 4.73
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