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Unformatted text preview: (Circle one) I give my permission for the public return of this exam. YES NO Chemistry 139 Name (printed) Exam 4 100 points Signature Fall 2007 Student Number Useful?: R = 0.0821 L . atm/mol . K = 8.314 J/mol . K; P tot = P i 1 atm = 760 torr K = 273 + o C G rxn = H rxn- T S rxn ; S o rxn = nS o prod- nS o react ; G o rxn = n G f o prod- n G f o react ; log(ab) = log a + log b; K w = 1.00 x 10-14 at 25 o C; density of water = 1.00 g/mL; x = - b b 2- 4ac 2a If N = A/B, then log N = log A - log B; If N = A b , then log N = b log A Multiple choice (2 pts ea.) PLACE THE BEST ANSWER IN THE SPACE PROVIDED!!! For the following two questions, consider a buffer prepared from 0.10 mol sodium dihydrogencitrate and 0.10 mol sodium monohydrogencitrate dissolved in water to give 1.00 L of solution. For the purposes of these questions, just consider citric acid to be a triprotic weak acid. 1. When a strong base is added to this buffer, it reacts with . (a) H 2 A (b) HA- (c) A 2- (d) H 3 A (e) H 2 A- (f) HA 2- (g) A 3- (h) H 3 O + (i) OH- (j) H 2 O 2. When a strong acid is added to this buffer, it reacts with 2....
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This note was uploaded on 03/30/2008 for the course CHM 139 taught by Professor Norman during the Spring '07 term at Sam Houston State University.
- Spring '07