{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

2008_06_03_13_20_02

2008_06_03_13_20_02 - Practice Test 3-1(Tcst3...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Practice Test 3-1(Tcst3 2006)—---——-Give the best answer or closest numerical value. FILL IN YOUR STUDENT ID NUMBER, NAME, AND TEST FORM=A; I. Which one of the following statements about strong acids is true? (a) All strong acids have H atoms bonded to electronegative oxygen atoms; (19 Strong acids are 100% ionized in water; the conjugate base of a strong acid is itself a strong base; (d) strong acids are very concentrated acids; F)’ strong acids produce solutions with a higher pH than weak acids 2. Which of the following acids gives the anion that is the strongest base in aqueous solution? @130; (b) HCIO; m HC104; (a) HNO3; yszl 3 Ka(HN02) = 4.6x10'4, Ka(HF) = 3.5 x 10'4, and Ka(HCOOH)= : 104; which of the follow would form the most basic 0.1 M solution? (a) KNOZ; (b) NaNQ3; (c) RbF; @ COOH; (e) cannot determine from the data 4. When a solution of 0.0066M NH; is diluted a factor of 10 by water which of the following will happen? (Kim Jeong ll special) (a the percent ionization will decrease and the pH will decrease; 1];le ., LL . _. (.i 7 k5 . . . . . . A ,0 ’ b] q ‘i O - the percent Ionization WIII Increase and the pH WIII decrease: ‘ c) the percent ionization will decrease and the pH will increase ,. (d) the percent ionization increase and the pH will increase; (a) the pH will increase and [Hao’] will increase; 5 pK.,(NH3)=4.74. What is the pOH of0.35MNH4Cl? (a)9.7l; (b)4.29;@.14; (d)4.86; (e) 7.00 Kin: ‘8‘“on ' “fin“ H;O ”‘”’7 Mrl‘s'l ("'50 ‘i-i ‘ Li 5” k0(:‘-é‘lto’3>:lv‘o‘tio"\‘ .gg H p») \ 0 c D ' 7.4 l I a l X lLl— 4.86 .— (.Itl _.o ‘1 .45-1 L'a : S Sicvio ;_..- “'U‘T‘w’ ( ‘4'? 6. Which of the following pairs of Ions cannot exist in large concentrations simultaneously In gqtieqous solution? (hint think about when you have a net ionic equation). (a) K' and F'; (b) H30+ and C|04+' . 69 “4+ 80d OH'; my and CN': /(e)/NH4 and F‘; /’ E I 7 Select the salt which when dissolved in water gives the most basic 0.000] M solution? (a) Nal; (b) KOCI3; @rl’z; (d) Sr(N03)2; (8) NH4BI’ “‘ ”U L ’ 5" H x M Llrlu‘,:;} HA 9! act! =5 8. Which of the following Is the strongest base? IX) fl; (b) NazTe; [{CH4; (d) NazSe; (@azs J ¢Wb ywi‘l 9. Calculate the percent ionization in a 0.35 M weak acid solution with pr = 10.92 (a) 1.1%; (b) 2.2%; @.8%Z (d) 15%; (e) great than 20% 10. in which of the following solution will acetic acid have the greatest percent ionization? (Kim Jeong II is the "Dear Leader") (a) 0.1M CH,COOH dissolved in 0.1 M HCl; WM CH3COOH dissolved in 0.2 M HCI; 0.1M CH3C00H dissolved in 0.1M CHJCOONa; Ad) 0.1M CH,COOH dissolved in 0.2 M CHJCOONa; @JM CHJCOOH dissolved in 0.1 M NaOH; 11. Calculate the pH and 82" in a 6.66 x 10'3 M H28 solution. pK.. = 5.89 and ng = 13.0 (a) 1.1 and I x 10-7; {$1.5 and I x 1043; (c) 5.6 and 3 x10'8; (d) 3.9 and I x 1043; (e) 4.5 and 1 x 10-7 ‘ {~75 ’ ~ >r7‘ I U l ,5 ‘rluJQ-I a C5 3: (612.11“) t J I; l (y) 7) o _ A ' i v Y (“\S ”t H10r"7 \S‘ + PHD W'- \ 1 E w a .71. t; ’ YIU M J 1 q 1‘ r f " I ’_ Al -3-8? -L “ j J \ D “I < ‘ - (2‘ v : ”" J t , . l G A IO l inJ bugs,” -)< blithely-j L j \ $26”: J Y " f‘ 7 (“‘40- (a 749, iii)" L ‘j( 4:21. a“ 17“: -l)‘)(") 35' 'bl ’ L~~j (new/5“ -E“ . ‘ 4 [Maw]: 10 L -l-‘HIOJ 12. Calculate the [H7104] afier 75.0 mL of 0.20 M KOH has been added to 100 mL of 0 M HZA (Kal = 1.5 x 10‘4 and ). (a) 1.5:: 104M; (b) 1.1 x10'5M; (c) 1.0x 10'13M; (d 8.0 x 10'7M; (e) 1.3 x10’3M Ka2=8.0x10‘ Obi-'1'; ’( .2) ; |§M-°‘ —»\ l» ._7 HA ” +— H‘ O __ .. HA' ‘Ox 1‘); IUW‘W‘"; HZA U; o [1 ‘ HA’JOV-l. 5—7 “204 A 7. it) \‘ K 7 —1. 5 Go L) 0""- e,'(0_4 1:)“ (Cir—J\. , "7) ’ ‘0 ‘0 "J to g S 1 ‘ ‘ J c 97-“) “miy w 2.,,_,,~,,,,~_,_____W, - ,,,_ ' C» ’ (inwr—vn :, Q [1.09) C ""‘"“"_C’.I. ‘M‘é‘ D (:2 1') 9’)“ ’3 z) 00 5 5w.“ " ). . . 13. Calculate the [OH'] in an aqucoiis solution that is: 2:125 M NH; and 0.300 M N114Cl. The value of Kb for NH, is 1.8 x 10". - - '5. -6. -5 + ~o (a) 0.425M, (b) 0.125 Mle’hJ—cflfix 10 , .5 x10 , (e) 4.3 x120“ ’ 9 NH“ +H’ o<——> NH 3 . “EU 13"”19641 log '[N _ CHBO'] : to ' : (.7410) , CUHHJ W e : , + . OS 1: OH' : l ’ ' a 25 103 fig..— f6 ‘6! 3 311%? ; aflwo i. , to 14. Which of the following pairs of can exist in large concentrations simultaneously in aqueous solution? (a) CH3NH3C1 and KOH; HCl and NaCN; 1.,(c)‘ HNO, and C113C02Na; (d) NH.CI and NaOH; gClz and CH3C02Na 15. A 25.00 mL sample of CH3CHZC00H was titrated to its equivalence point by 35.3! mL .104 M KOH. What was the concentration of the original acid solution? (pKa = 4.88) (a) 0.0736 M; (b) 0.128 M; (c) .147 M; (d) 0.162 M; (c) 0.295 M CAUA : (5‘10. \ (A (.nsu):(610‘43(.u’€5§\) CA ; . 0H- 16 For thetitration of 50.0 mL of 0.020 M aqueous weak acid (HA) with pKa = 2.97 with 30.0 mL of 0.020 M KOH, calculate the soot ‘ pH.’(a)’3.15; (b) 2.12; (c)2.97; (d) 2.33; (e) 7.00 g r u : I’m-t lo a, ( ‘75..) P111: ( /DL M\ , ¥lA 4 CL] ‘4‘“. I 9 [7 (A? ‘3 [¢\’ \lss )(uno )— .ou Ma\§ WI . M09 ; w . o ._ 3‘14 .14: U13“) ( .o-Lon) : 1000(0 w... - ”M, {Lows i F, l swag, “:00qu M67 .— ' "10““ ‘3 17 For st0, at 25°C, K.. = 1.3 x 10'2 and Kn2 = 5.6 2,13“. Irso mi 0101 M H280, is titrated by 30 mL (b 6.6; of 0.2MNaOH, what is the pH.(a) 6.3 or less; (c) 7.3; (d) 7.9; (e) 8.3 or more. , , ,. Wn-(nt ~>~s . . 'Li v — \ — ~ 1 P4: PKCinig * 4“. ‘1’" "‘ ‘ “"‘ H2205" Q «'V—5 H50} 4 H10 F§03 40 H—7 305'“ )0 30r— D“. t (ELBOWLBw-MJ 5 1 (o D 00 '2" l i \9 ‘ 5-0 _ ,7 25 '30: a.-. l .. -. l" .. . , mm) 0 \ 5' . ~90 ‘”1‘ o i no : Q .(oq 18. How many grams of NaOH, W = 40g/mol) is required to make a pH = 9.22 buffer from 4.0 L of 0.555 M HCN (pKa = 9.31) (a)_10; (b)20; (c)30; 40; (c)50 ,2 HC N 4. on g.) C M‘ A .410 44“.)1'12M/ ._ . 0.12:413l1103 ;. g a (‘37-'1le q i A J . ~ l o .0 Clr_ ' ’.u‘l .7 \/ i‘ K ./ \/ XV fffl’ l0 : . Si; 7 , \z p ’1 W‘r 0 y "4 ‘24797;1.f /_-_I9.’im°l 19. Which one of the follow is a buffer with pH > 7? pr(Cl~l3C00H) = 9.26 and pKa (Ni-l3) = 9.26 (Chirac os pompous!!!) (a) 10 mL 010.1 M CH3COOH + 10 mL 0101 M NaOH; (b) 10 ml. of0.l M CH3COOH + 10 mL 0101 M NaCH3COO; 610 mL of0.1 M N113 + 5 mL of0.l M HCI; @10 mL of0.1 M NH3 +10 mL'ofOJ M NH4CI; (c)10 mL 0101 M NH3 +10 mL of0.l M HCI 20. If a small amount of a strong base is added to a buffer made up of a weak acid, HA and the sodium salt of its conjugate base, NaA, the of the buffer solution does not change appreciably because (a) KI goes up and Kb goes down (b he strong base causes only a small increase in pH; (c) some A' is converted to HA; '(d) the strong base causes only a small decrease in pH; (e) there is no change in any ionic concenumion FILL IN YOUR STUDENT ID NUMBER, NAME, AND TEST FORM=A; ...
View Full Document

{[ snackBarMessage ]}