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Chemistry 1210 Quiz 9A 11/4/02 Dr. B. Jackson 91. Code A 92. If a small amount of acid were added to a buffer, the acid would react with the a) acid b) salt 93. What is the major buffer system in the blood? a) organic phosphates b) lactic acid c) carbonic acid 94. A buffer is a) a mixture of a weak acid and a weak base b) a mixture of a weak acid and its salt 95. In hyperventilation the pH of the blood goes a) up b) down 96. What would be the pH of a buffer system which had 0.5 moles of acid and 0.1 moles of salt and the pKa is 4.5? a) 3.8 b) 4.7 c) 5.2 97. If a buffer system had a pKa of 7.2 and a 1:2 ratio of salt to acid, the pH would be a) lower than 7.2 b) greater than 7.2 98. Which of the following acids is the strongest? a) acetic acid Ka 1.8 x 10-5 b) boric acid Ka 5.75 x 10-10 c) formic Ka 1.78 x 10-4 99. Given 2 SO2 + O2 <------> 2 S03
Which of the following is the expression for the equilibrium constant? a) Keq = [SO2] [O2] b) Keq = [SO2]2 [O2] __________ __________
[SO3] [SO3]2
c) Keq = [SO3] d) Keq = [SO3] 2 __________ __________ [SO2] [O2] [SO2]2 [O2]
e) 2 [SO3] ___________ 2 [SO2] [O2] 100. When a reaction has a Keq greater than 1, the reactions favors a) reactants b) products
Ans: 91a; 92b; 93c; 94b; 95a; 96a; 97a; 98c; 99d; 100b |
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Wednesday, March 21, 2007 01:28:01 PM |