12/14/2016 RWW13 Buffershttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314094 1/2Current Score : – / 100 Due : Tuesday, November 1 2016 11:59 PM EDT1. –/10 pointsSelect all of the following that would be acceptable conjugate acidbase pairs to use in the preparation ofa pH=9.8 buffer.HF/KFH2S/KHSKHS/K2SKHSO3/K2SO3 KHCO3/K2CO3 HCN/KCNHNO2/KNO2 NH4Cl/NH32. –/18 pointsWhat is the pH of a solution prepared by dissolving 18 mmol of a weak base in 200 mL of a 0.114Msolution of its conjugate acid if pKa = 4.16 for the acid.pH = (No Response) 4.063. –/18 pointsHow many mL (to the nearest mL) of 0.159M KF solution should be added to 280. mL of 0.157M HF toprepare a pH = 4.00 solution?(No Response) 1990 mL KF4. –/18 pointsHow many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 600. mL of1.221M solution of NH3 in order to prepare a pH = 9.20 buffer? (No Response) 43.97 gRWW13 Buffers (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 RWW13 Buffershttp://www.webassign.net/web/Student/AssignmentResponses/view_key?dep=14314094 2/25. –/18 pointsWhat volume (to the nearest 0.1 mL) of 4.70M NaOH must be added to 0.300 L of 0.300M HNO2 toprepare a pH = 3.80 buffer? (No Response) 13.7 mL6. –/18 pointsWhat volume (to the nearest 0.1 mL) of 4.10M HCl must be added to 0.650 L of 0.250M K2HPO4 toprepare a pH = 6.50 buffer? (No Response) 33.2
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