key-q5ab - _ Quiz Number 5 _ Chemistry 122, Dr. Mathews ’...

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Unformatted text preview: _ Quiz Number 5 _ Chemistry 122, Dr. Mathews ’ Monday, Feb 26, 2007 Name '5 I 1 , Carmen ID 1 Lab Instructor/Section No: - 1. (3 pts) Give the conjugate base of the following Bronsted-Lowry acids: Ca) H103 “1’0; b) H2P04' twat?" c) NH4+ [1H3 2. (3 pts) Deuterium oxide (D20, where D is the hydrogen-2 isotope) has an ion-product constant, Kw, of 8.9 x 10'16 at 20 °C. Calculate [D+] and [OD' ] for pure D20 at this temperature. ‘ I Kw” Coo’lefi : 3.92%”4 z x 2’ XL “[0227: [05% 3.02%“8 3. (6 pts) The acid-dissociation constant for hypochlorous acid (HClO) is 3.0 x10“. Calculate the concentrations of H30“, C10 ' , and HClO at equilibrium if the initial concentration of HClO is 0.0075 M. #fl/D HAO '3 AW +~ Mo“ , X X 010075 'x 3' W: (9 75’ .. 7" , z X. a, , /52</0 6 .59 {9.9975 .00 3M0 gfiz’affiw 3.20.0075 > X approx 0% 4. (8 pts)Hydrogen sulfide (H28) is a diprotic acid. Its acid dissociation constants are K,l = 9.5 x 10'8 and Kat: = 1.00 x 10'”. If 0.0100 mol of hydrogen sulfide 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. i _ 5- ,; ,4 f: 0+ I, 2" H75 My 7: “30+ +5}, a f: '3 2’0 5' lit/Jr s 3' Km 3»): x —bi b2 —4ac 1 Quiz Number 5 p ' Chemistry 122, Dr. Mathews > Wednesday, Feb 28, 2007 Name I 7 ' l , Carmen ID Lab Instructor/Section No: 1. (2 pts) Consider the species, H2C605H7 '. . n c t V ' (7 a) What 1s the conjugate acrd of this spec1es. H 1‘6 4 of Hg b) what is the conjugate base of this species? H1. as 45 )4 7— 2- 2. (4 pts) Calculate the pH for each of the following solutions and indicate if it is acidic or basic: a) [OH-]=8.8x10'8M ‘POH 3 70" KPH; “900 '7‘” 3 6'7"! ; Jal‘J‘ , — 7 - :3, , ~ 7 b) a solution cbntaining 1.0 x 10'9 M HCl 30152; /”0 +/’ 02V ? *" /’ 0WD , 7: f/ a==~ 7. 0 mafifd/ b) a solution in which the hydroxide ion concentration is 1000 times greater than the hydrogen ion concentration. [OH‘j = /000:-H3Jfl ‘ . 30%,?6? ‘1— Kw = /. 0 WW =51, pagan-j: [H305 (3%, 3:9,-.. 5.9,; a n. o 3. (6 pts) Boric acid, B(OH)3 is used as a mild antiseptic. 'What is thepfi of a 0.035 M aqueous solution of boric acid (Ka = 5.9 x ' B(0H)3 (“1) + 'A 20(1) "“ B(OH)4-(a<1) + H30+ (3C1) (ma/£5 ,x X , 40 .ZL— 1}: ’5'“ /(a : 510' X/O :&.03$-.% :97?“ 6452965»? 2:12PM" 0K 4. (8 pts) Phthalic acid (H2C8H4O4), abbreviated HzPh, is a diprotic acid. Its acid dissociation constants are Kal = 1.26 x 10'3 and K2 = 3.10 x 106. If 0.0100 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. —bi— b2—4ac 2a ...
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This note was uploaded on 07/17/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.

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key-q5ab - _ Quiz Number 5 _ Chemistry 122, Dr. Mathews ’...

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