1B-Quiz-4-key

1B-Quiz-4-key - _ 1-.— Name KC- Quiz 4 — Buffer...

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Unformatted text preview: _ 1-.— Name KC- Quiz 4 — Buffer Solutions and Titrations I) A 25.00 mL sample of [-11 requires 52.98 mL of 0.159 M Ba{OH)2 for complete neutralization. What is the concentration of the acid? 516‘s MLXOJ‘S"! “ml MGR): gawk “I “mg ml. Mai-ml ‘BGLGJHXL 00 ml. 2) Using a buret, you acid 29.34 ml. of 0.09967 M strontium hydroxide to 25.00 mL of 0.2076 M hydrochloric acid containing a couple drops of phenol phthalein. What color will your sample be? (phenolphthalein is clear below, and pink above, pH 8.2) Flklb EXCESS \-\+ or; 0p." 2 99.3% mon-Oqalb'lmwul SJOME K ammoi aq— 7— 5.8”“ «ml OH— ML— MM\SF(M\L 05.00 c 0.21316MHO + "‘ " KM“ H : 3.1fi0mw\H+ ML: Mml HC\ Excess on“; ggqqmud - §.l‘\0mml s (1.650(le 0H- 0.65‘uw-Olo“ = O‘OIZIM >2.) ?0H= l-‘H‘o acme ml.— _ 3) 15.0 ml. of a 0.010 M solution of phosphoric acid is titrated with 0.011 M NaOI 1. Kn] : 7.1 x10'3 16.0 MLX (’3, 010 mm\ Ham-.4 Kaz = 6.3 x10‘8 K33 = 4.2 x 10-13 ML a) What is the pH when 5.00 mL of base has been added? I.) PO S-othK 0.0: w, ambit : 0.055 MIMI “km 4/.— now M (H Hz «1 15 ML - ' FomE‘h “SFOH EEflNMtNQ'. PA 7 RI“: + 10% 0.055 0. 015' 6'15MW\“0.055MM0\=O.OC15“"°\ REFOH ipars I.°i ' b) What volume is required to get to the first midpoint (midpoint of the bu ffer region}? uowme 0F McLOH {2.561. TO 6-HT 0‘15"”W" 1:) 0.075 “Mal WOH c) What is the pH at the first and second midpoints? M‘ wDPow-TS! PH = Pko.‘ ==> Phat: -la%(7.\xlo‘5) =‘-7 9H = 1.15” PH 2 Pkg; ::> fkalaf’ -\°%(5'3k{0h8) % d) What is the pH at the first and second equivalence points? F“ = FWD“ this ___ pKRfZIJES 7V . Iu 4) What will the pH be if 4.00 mL of1.0 M NaOH is added to 225 mL of a 0.300 M acetic acidfacetate buffer with an initial pH of 4.00? The Ka for acetic acid is 1.8 x 10—5. 0“] Er] _ ll 00: “'70 1” l' F7 0:13 = ::: ‘ =O.l6 Ht: TEH'Q {WEB > [k 3 E 3 Cr] +1:th :- 0. 360 M o. £81:ij Qua]: 0.300.“ mocha.1< l-Umwlem i-l8tflkj=0,gwm 2) [any] «— 0,11qu 9005 ML ,c o .25me HR Mk— [IV]: 0.0%; M = 57.1“...91 HA PH: mm + \WCQH 4- “L0 ) 935.4, Normand A‘ 57.7. “1.0 MI :- lg'qwmp‘v ' iPH=LLl1 I 5) What volumes of the following two solutions should be mixed to prepare 500.0 mL of solution with a pH of 5.00? The Ka for acetic acid is 1.5 x 10-5. solution 1: acetic acid = 0.110 M solution 2: sodium acetate 2 0.110 M V - V e 5.00 '5 LL7H +1 .1. z) '3 g L _ 0‘3— Vi-iw [ l V ::> V“: _ l'glvuk HR VP; If Vim 7' 5—00.0mL l-‘BlvwivflM = 500.0% ...
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1B-Quiz-4-key - _ 1-.— Name KC- Quiz 4 — Buffer...

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