Exam 2 p5

# Exam 2 p5 - 6[MM(09 19 Iko/levq ’3 Jarret” “1 3...

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Unformatted text preview: 6 [MM [(09] ,+ 19- Iko/levq) ’3 Jarret” “1+3 1" v/MNH‘IW EXIJ VO/uw :2nge5 12. 1 point. Which of the following mixtures would result in buffered solutions when 1.0 L of each of e two solutions are mixed? 0.1 M KOH and 0.2 M NH4C1 (b) 0.1 M KOH and 0.1 M NH4C1 (c) 0.1 M KOH and 0.2 M NH3 (d) 0.2 M KOH and 0.1 M NH4C1 13. 9 points. Consider the titration of a generic weak acid HA with a strong base that gives the following titration curve. On the curve, indicate the points that correspond to the following: (a) the stoichiornetric (equivalence) point pH (b) the point with maximum buffering (C) pH = pKa (d) pH depends only on [HA] (e) pH depends only on [A-] (f) pH depends only on the amount of excess (51) strong base added. Vommg 9i: Base (g) At the equivalence point, is the pH neutral, acidic, 0. (Circle one) A- + #10 '2 [{A D:‘/ (h) At the equivalence point, what is the equilibrium reaction that determines the pH? 2 (k) Give one important difference between a weak acid titration and a strong acid titration. Qirowﬁ nus—id Q] s Pref] (90.5: T at" if—w'vafewu: (9495c5foue‘d‘c) por‘ué pH :7 (I) Larjer ver Flu»? r9330“ _ ‘- (1’)”,0 éugflef ﬁller”! (1,) [H— (:23?wa “it may“, it rue: More slow/j . 14. 4 points. Two drops of indicator HIn (Ka = 1.0 x 107), where Hln is yellow and In' is blue, are placed in 100.0 mL of0.10 M HCl. (a) What color is the solution initially. You my ._ [MU tailor Whig 5‘ 9 H I V‘ (b) The solution is titrated with 0.10 M NaOH. At what pH will the color change (yellow to greenish yellow) ﬁrst become visible to the human eye? - _ . v " . + “Lian [1h 3 '_ l HLM 2;? i“ 4. H w ' '— -_ - ‘ mm to (A - {MW} : (~0Xlo7 a’ f rem , (c) What will the ratio of [In'] / [HIn] be at this pH? .— LL» iii #1 ‘5) EH +1 1 10.. (0 ‘° (3 l-l : (o 15. 4 points. Bismuth sulﬁde, BigSg , has a solubility of 1.0 x 10'15 mol/L at 25°C . (a) Write a balanced equation for the dissolving of bismuth sulﬁde in water. A Hp 1+ 7. — . _____> 7 m 3.; l " 7." g (b) Write the Ksp expression for this process. ks .._ L13, ; 1 E S 1 (D 1. '1'; 3 ’7 5’ . -_(2 0&0" § (3.61MB "’ log X \0 gram» ( c) .5: F 7 ,3 ...
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