CHM 4 SECT.\'s 001&002 al.77x TEST 2: CHAP\'s 15 &16 MONDAY FEBRUARY 22D 2016 An
ID: 1086706 • Letter: C
Question
CHM 4 SECT.'s 001&002 al.77x TEST 2: CHAP's 15 &16 MONDAY FEBRUARY 22D 2016 Answer all questions in the examination booklet (10 pts. cach) 1) Identify the conjugate acid-base pairs in each reaction: a) CH,CH,NH, HO CH,CH,NH O b)Hco,.HH 2) Calculate the correct pH of each solution: a)3.5x10"MHClo, b)0.015 M LioH 3) Calculate the correct pH of a 0.13 M solution of C,H,O,H, (,-79 x 10) 4) Calculate the pH of a 0.06M solution of KCio, (K,-3.4 x 10") 5) A 0.12 M solution of HCN has a pH of 5.1. What is the value of K, for HCN? 6) A 35 mL. solution of 0.15 M HBr is titrated with 0.09 M NaOH: c) What volume of Na0lH nedsto be added to reach the equivalence point? b) What is the pH at the midpoint? c) What is the pH at the equivalence point? 7) A 40 mL solution of 0.2 MC,H,O,H (K, 1.8 x 10) is titrated with 0.13 M KOH: a) What volume of KOH needs to be added to reach the equivalence point? b) What is the pH at the midpoint? c) What is the pH at the equivalence point? 8) What is the pH of a buffer made by dissolving 2.3 grams of NaCN in 100 mL of a 0.25 M solution of HCN (K,-6.2 x 10"") 9) Determine the pH of a buffer after the addition of a 5 mL. sample of 2 M HCI to 250 mL of solution which is 0.13 M HBrO (K, 2 x 10) and 0.15 M NaBro. 10) How many mL oro.22MKCO H must be added to 100 mL of0.15 MHCOrH (K.-L77 x 10) to produce a buffer with pH-4.007 pH-(oq (3.SK) p4 046 ptExplanation / Answer
Answer for ques no-1
conjugate acid conjugate base
(a) CH3CH2NH3+ OH-
(b) H3O+ HCO3-