M_562779_2009-05-28

M_562779_2009-05-28 - PAGE I CHE 1303 TEST HI DR. POWELL...

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Unformatted text preview: PAGE I CHE 1303 TEST HI DR. POWELL *— ‘ - . \7 _ _ APRIL 4, 2008 Please print your name on both the test paper and the Scan Tron form. SECTION1. MULTIPLE CHOICE (7 points each). 1. Which of the following buffer solutions should have the highest pH? @ 0.075 M KBr02/0.025 M HBro2 ‘ 3/ 11 [A : b) 0.075 M KBr02/ 0.050 M HBrOz :15 c) 0.040 M KBrOzl 0.025 M HBro2 .40 d) 0.050 M KBrOzl 0.025 M HBro2 ; 9, e) 0.025 M KBrOzl 0.040 M HBro2 4995/ , fl x Which of the following 0.100 M solutions has the highest pH? KJ'HA,Ka=2x10'3 HA, Ka = 8.0 x 10"3 c) HCl d) HA, Ka = 3.2 x 10“1 ,fl; \ @NHs, Kb = 1.8 X 10'5 >_ N j X Three weak acids and their Ka values are: % firod‘j U051 _/‘ Acetic acid, Ka = 1.8 x 10"; fl W 7 J \r~ " Hypochlorous acid, Ka = 1.1 x 108; we“ ” ‘ \ Hypobromous acid, Ka = 2.1 x 10'9 Which of the following is the strongest. base? a) CH3COO' b) ocr @BF @Hoer e) HOCI '14. y/ What is the conjugate base of OH' a) H20 b) HOH c) 0H2+ d) H30+ 0 02- SECTION 2. PROBLEMS (10 points each).\ .\ \J r \_ 4 I ./ ' / (9 A 0.200 M solution of a chloroa tic acid is 11.00% ionized. What is the K21 for this acid f; x . °f\ : .092 . a A; s; a) 0.200 X g (‘9) , : 2.72 x 10-3 ' , ‘ y c) 2.42 x 10‘3 A —-—-«—«~—;*';'~ 5°90“ / d) 4.84x104 E 51"“ '0 ' C0 993 I k x / e) 1.21 x10-2 épxmaL F\ ‘l/ {\Qé. / The Kb f9r pyridine, C5H5N is 1.50 x 109. What is the pH of a 0.075’M solution of pyridine? -. A w V ; I ~ a) 4395U'W‘0 ‘9 7 X9 49‘ “W 000‘ .jlfllaqxloléw- mm hut/filk/Q‘ “l b) 9.95 .% \.50><\0’”‘ JIX/0~/L/ 3133 *9: 50099716 4.05 \4: V7.00 yiO‘Ll P0; 40947.0(?x 10‘” : 315’ . PAGE 2 /\\ 7. ‘i A 1.00-L saturated solution of calcium fifluoride, Can, is 2.14 x 10“ M. Calculate the KSp of . . J \- , caICIum fluoride. C OX 9 A Ca 4} Q? a) 6.27x10-10l / 95 b) 9.80x10-12 C v) @219“ 10-11 i; H 6.10 x10-3 _ - _: E e) 4.58x1o-8 [(EMHHO 0‘) 962-‘Wl0qf 3.9%”) (X) Calculate the pH of a 0.500 M solution of NaCN. (Ka for HCN = 4.90 x 10-10) - O l A \l a) 931 «\ogHC’lOXlO \ EA "’Y <_ if b) 9.19 3; 5 x x @i 4.81 L .g V? 11.50 ANSWER THE FOLLOWING QUESTIONS ON THE TEST PAPER base: YOU MUST SHOW ALL OF YOUR WORK IF YOU WISH TO RECEIVE ANY CREDITl! ‘ “61°50 memos 2113.053 . . 1. How many grams of sodium lactate should be added to 1.00-L of 0.150 M lactic aCId(HC3H5O3) to form a buffer solution with pH 4.00? (Ka for Lactic acid = 1.40 x 10-4) (12 POINTS) womb—q 1530 : was @hgogt R90 ficgtha N30 Waite/)3 MEL-:03 .9\ M 1‘90“ 2193.539 (41.70% \L 0% \\ 2. Calculate the solubility, in g/100mL, of LaF3 in a 0.020 M KF solution. / Ks for LaF =2.00x10-19 (10 POIN S) //./‘\( we. :" us? i a? 61 m“ m 553.9313 «3: :l‘leO 1 ‘09 “1;” \m mm C __‘75 36 l M: 6 (9.9 3 3 , sit/gm 5 gxlli/ Lola W59“ x Um 8X10. _ % \ 3: 96»le M 3. What is the pH of a 1.0-L solution which is 0.120 M propionic acid (CH3CH2COOH) and “$35100 0.160 M sodium propionate after the addition of 0.0340 mol HBr gas? Assume no volume 016d: .90 change. a for propionic acid = 1.30 x 10-5) (10 POINTS) Q‘QCX K “\ «‘30X\BQ§§JK\O ALDO“ O HO .. tin" 0“ C3 ‘ :> HEEfiM 1902} beta. F71 7 :> mat 103%? => \501 / WU ...
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This note was uploaded on 05/06/2010 for the course CHE 1103 taught by Professor Ermler during the Spring '08 term at Texas San Antonio.

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M_562779_2009-05-28 - PAGE I CHE 1303 TEST HI DR. POWELL...

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