key-q5cde - Quiz Number 5 Chemistry 122, Dr. Mathews »...

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Unformatted text preview: Quiz Number 5 Chemistry 122, Dr. Mathews » Tuesday, Feb 27, 2007 Name Carmen ID Lab Instructor/Section No: l. (2 pts) Label each of the following as a strong acid, a weak acid, or a - species with negligible acidity: a)HPO42‘ Wm wen gamma/“Z . 2. (4 pts) Predict the products of the following acid-base reactions, and also predict whether the equilibrium lies to KEtfre left or to the right of the equation: [7651; 1 525,4 ac. _ be . 53’ a) otraco + H200): 0M7?) 7L O/J (8;) . )9 'erwger 07(1):! '39; [[125 b) Iciééwaq) + £79321): 6%;2${&;)+ J ($7) 60 7" ‘ 5 #("mgef hast F ‘- 3 I 3. (6 pts) Calculate the pH and percent ionization of 0.500 M solution of hydrazoic acid (HN33M \ 2 I ’1‘ p W t- f 0! / /7L//37LM20‘° #39 +33 memfiv: 0:) 0,500 K - ' rx * l- 2. . Kg» 35 N0 » 0‘90.“ ,9, I»: 0.0 saggy} :0 7M 2 361/0497?) #70270 4. (8 pts) Phthalic acid (H2C8H4O4), abbreviated H2Ph, is a diprotic acid. Its acid dissociation constants are K2!1 = 1.26 x 10'3 and K32 = 3.10 x 10“. If 0.015 mol of phthalic acid is dissolved and diluted to 1.000 liter of solution, calculate the equilibrium concentrations of all species present. Be careful of approximations, state each clearly and check each. ' 7/ M40 '3 AQMHW» " c) 0 ’1’ '— ——bi b2 ——4ac 2a Quiz Number 5 Chemistry 122, Dr. Mathews Tuesday, Feb 27, 2007 Name ' V Carmen ID Lab Instructor/Section No: 1. (2 pts) Label each of the following as a strong acid, a weak acid, or a species with negligible acidity: { ~ . “1' 3,27%!) A422. ‘ b) HCO3? 2. (4 pts) Predict the products of the following acid-base reactions, and also predict whether the equilibrium lies to the left or to the right i l of the equation: Jé/‘J gag ad , £74958 , a) chHsoz (aq) + HS“ (aq) = #15 +\ 3 § HCtHgoz [‘9 r" a . _ _ 2-. b) H003 (aq) + F (aq) = #F + (“0 mini base» chef! 3&6?”— w3”; {'1’ “’5” A?“ 7%” ‘ m.mmm..,}““‘° 3. (6 pts) Calculate the pH of a 0.10 M aqueous solution of AlCl3. K, = 1.4 x 10'5 for the acid dissociation of the hydrated aluminum ion - A1(H20)63+ (3(1) + H200) " [A1(H20)50H]2+ (m) + H30+e(aQ) 0J0 ‘7 a mix ,x' V 2r 9 I 7 H; . 4. (8 pts) Sulfurous acid (H2803) is a diprotic acid formed by dissolving SO2 in water, with acid 6 c1ation constants of K,1 = 1.3 x 10'2 and K,2 = 6.3 x 10'8. Calculate the equilibrium concentrations of all species present in a solution initially 0.25 M in sulfurous acid . Be careful of any approximations, state each clearly, . 2. >_, . . ’ I“, fig” - " ~ . ' ‘ /<’a=//¢K/t99fi9f;( ’00,!” 2) 2t Saab/117’ («PSSWWZM 0 and check each. » -_ r ’2/ so +4.0 :2 M HM " M; “’7’” '5" M" 7“ 5%?“ L 53 ‘ } M30? 0,053? 0f; A X I ' “7K 1'77“ K A], s {,3 My?» za/E-eizgwx Kn: £3 No.3, : memm (3,0509’70 r; x: (0503720; .— 1}an ;m:7\ ,,,, .m...__.......~-_ iuanranL/L er: Quiz Number 5 Chemistry 122, Dr. Mathews Thursday, Mar 1, 2007 Name V _ 7 Carmen ID ‘ Lab Instructor/Section No: 1. (2 pts) Give the conjugate acid of the following Bronsted—Lowry bases: b) CH3NH2 ‘ @713 ’ ‘ 2. (4 pts) Calculate the pH and pOH for the following solutions: a) 0.15MKOH 2:7 fp#j=.&,_/§Zi / 270%: 5,37— / 77/7,;3’1/3 b) 0.20MBa(OH)2 Kafka/0' 20,9; 0,7217! Fahl: flfi/OJ ? 25/: )3. 50 c) a solution formed by mixing 10.0 mL of 0.300 M HBr with 40.0 of 0.100 M HCl. + 700 nap/es )4 A » : 0.00 000 «kaoot‘ooo =~ 0:0” fly » ( OIOIOFLY 01300”) 7‘ (0'09‘09/0/00’9 C3,”): 0.00700 mates - a/4M3%\ ? 3. (6 pts) Trimethylamine, (CH3)3N, is a gas with a fishy, ammonialike odor. An Mus“ solution that ' H :03; . 0.25 M trimethylamine has a pH of 11.63. What is Kb for trimethylamine? 2“ L :: 5 7“ M10 '5: ‘7" f- ayn k g (at ’3‘} 0,1,2}; 7‘“ 1’ ‘ [0290,5043 bad. PHg “(93);, 770,4: .2375 forljzx: 0.00%? 4. (8 pts) Carbonic acid, H2C03, can be found in a wide variety of body fluids (from dissolved C02). Its acid dissociation constants are Ka1 = 4.3 x 10'7 and K,2 = 4.8 x 10'“. If 0.0010 mol of carbonic acid is dissolved ‘ and diluted to 1.000 liter of solution, calculate the equilibrium concentrations of all species present. Be careful of approximations, state each clearly and check each. » a/zfla, W 2 $03“ 7L 19537 #00;+1é0 :2 250+; @032” am 10 2c X 2”er ‘zllxo‘ ' 7‘ 5 2— ,w x +72 K K6,, : x743m'7fimm -K “Nam . ' . 4L [z/w’ 790/20 gate/[315$ ’ {)0 fi/K) ...
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This note was uploaded on 06/11/2011 for the course CHM 122 taught by Professor Woodward during the Winter '07 term at Ohio State.

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key-q5cde - Quiz Number 5 Chemistry 122, Dr. Mathews »...

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