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Studying the Effect of Buffering on the Resistance of a Solution to pH Change (4)

Studying the Effect of Buffering on the Resistance of a Solution to pH Change (4)

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Unformatted text preview: 102 Principles of Chemistry II (3) What conclusions can you draw from your experimental data about the accuracy of chemi indicator solutions for determining the pH of a solution? Briefly explain. EKu/l" 73H Chin M £2. [mi W {1.4: WLCfi/\ “Jinx Olnhf accéwfli" it: raggfi‘ (4) Based on your experimental data, compare the relative abilities of a buffer solution and distilled water to resist pH changes upon addition of either acidic or basic solutions. Briefly explain your reasoning. “81!;qu w,” ma-‘r pH- cMfl}. Mafia-r W [+g P“FP$°L is +° Pro-taci— .+ From, 0% WWM nil—tag“ . Suppose you made a buffer solution that was 0.050M in both HC2H302 and NaC2H302. Would the pH changes resulting from the addition of 0.1M HCl solution to this buffer solution be the same as those you observed in this experiment? Briefly explain. “9 beams}... MOEOU'li'M ”F lid—r LMCF—u‘ rs kaffi mf- WW ”- Ufl.’ M. 1‘1), expo—:st' SO +1.1... PH wt" Lk-Wjflw 543% M ‘flr/C Pros/em . (1) Calculate the pH of a buffer solution that is 0.40M in both HC2H302 and NaC2H302. axon-7 1 k“ (C? ’43 Oz] i/‘IICZH5GSJ km -: /, Bar (0' s F (2) Calculate the pH of a buffer solution that is 0.10M in HC2H302 and 0.40M in NaCzl-IaOz. WW (,0 _____,___.__.—— 1 4/,sx/o—S- ' ‘1’ Hzfiav -/dj({45k/o") 7fH35-3S‘ (3) Assume you have 1 L of each of the buffer solutions described in questions 3(1) and 3(2). To which buffer solution could you add the larger volume of 0.10M NaOl-I solution without causing a pH change of more than one or two pH units? Briefly explain. 7LL ‘4 ‘ 2 “'3 ° 2 54» M:— IIL...‘ #455 (ml-Cur L‘wv‘ hdué , J1,» “LEW”? u—k‘l an..\y 4504+ I . Calculate Ka for the weak acid HA, given that a buffer solution that is 0.30M in HA and 0.30M in NaAtw—s‘ has a pH of 5.03. #499 andfie/‘ewm 13.0 Fk‘x " - ’03 kc. 5,03 = '/0;Arc ‘SIOSA' )0} («ck 14.1 = 73; yo" ...
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