12 14 2016 RWW12 pH of Acids and Bases Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren WebAssign RWW12 pH of Acids and Bases Homework Current Score 100 Due Tuesday October 25 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 12 points Assume negliglible ionization to determine the percent ionization of each of the following acids and then indicate whether the assumption was valid a 0 800 M solution of cyannic acid HCNO pKa 3 46 ionization No Response 2 09 valid No Response Yes b 0 1000 M solution of hydroazoic acid HN3 pKa 4 60 ionization No Response 1 58 valid No Response Yes c 0 010 M solution of benzoic acid HC7H5O2 pKa 4 19 ionization No Response 8 06 http www webassign net web Student Assignment Responses view key dep 14314093 valid No Response No 1 4 12 14 2016 RWW12 pH of Acids and Bases 2 10 points A solution is labeled 0 451 M HClO What are the following in the solution Express your answers to three significant figures even when only two are valid Acid base table HClO No Response 0 451 M H3O1 No Response 1 26e 04 M ClO1 No Response 1 26e 04 M pH No Response 3 90 3 10 points Determine the following in a 0 0860 M solution of HIO3 Ka 0 170 HIO3 No Response 0 0232 M IO31 No Response 0 0628 M H3O1 No Response 0 0628 M pH No Response 1 200 4 8 points What is the Ka of the acid HZ if a 0 0739 M solution has a pH of 2 050 Ka No Response 1 22e 03 http www webassign net web Student Assignment Responses view key dep 14314093 2 4 12 14 2016 RWW12 pH of Acids and Bases 5 8 points What is the pKa of HX if X1 0 069 M in a 0 128 M solution of HX pKa No Response 1 09 6 8 points What is the percent dissociation of HX pKa 6 09 in a 0 242 M solution No Response 1 83E 01 7 8 points How many millimoles of HX pKa 1 69 are required to make 350 mL of a solution with a pH of 2 55 No Response 1 12E 00 mmol HX 8 16 points Calculate the concentrations of all species in a 0 210 M solution of H2X if K1 1 58E 06 and K2 2 82E 09 H2X No Response 0 210 M H3O1 No Response 5 76E 04 M HX1 No Response 5 76E 04 M X2 No Response 2 82E 09 M http www webassign net web Student Assignment Responses view key dep 14314093 3 4 12 14 2016 RWW12 pH of Acids and Bases 9 8 points What is the pKb of a weak base KA if the pH of a 0 085 M solution of KA is 10 18 pKb No Response 6 57 10 12 points Indicate whether each of the following salts are acidic a basic b or neutral n K3PO4 No Response Basic KH2PO4 No Response Acidic KBr No Response Neutral NH4NO2 No Response Acidic http www webassign net web Student Assignment Responses view key dep 14314093 4 4
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