practice exam2B-spring 2011

# practice exam2B-spring 2011 - All of these examples have...

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All of these examples have multiple choice answers, however, all of the problems on your exam will not be multiple choice. I suggest you take the time to learn the concepts and how to apply them to the problems. Be sure you can show all work for the problems the require it! Even if you can do it in your head. If there is a formula or method that was taught, use it! There will be multiple choice questions that require you to show your work as well. 1A For the reaction CN - (aq) + H 2 O(l) HCN(aq) + OH - (aq) one of the acid-base conjugate pairs is: 1. HCN, H 2 O 2. HCN, CN - 3. H 2 O, CN - 4. HCN, OH - 5. CN - , OH - Answer: 2 1B What is the H 3 O + ion concentration in an aqueous solution having an OH - concentration of 1.0 x 10 -2 M ? 1. 1.0 x 10 -2 M 2. 13 x 10 -2 M 3. 12 x 10 -2 M 4. 1.0 x 10 -12 M 5. 12 x 10 -12 M Answer: 4 1C If the pH of a solution is 4.40: 1. [H 3 O + ] = 4.0 x 10 -5 M 2. [H 3 O + ] = 2.5 x 10 -4 M 3. [OH - ] = 3.4 x 10 -9 M 4. [OH - ] = 2.5 x 10 -11 M 5. pOH = 18.80 Answer: 1

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practice exam2B-spring 2011 - All of these examples have...

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