Chem 112Exam 3SP 2008Name _______________________Multiple choice.6 pointseach. Partial credit may be awarded if some work or comments are shown.Assume 25oC, aqueous solutions and Kw=1.00 x 10−14unless otherwise stated.1. Hydrofluoric acid, HF, is a weak acid with Ka=6.8 x 10−4.Calculate the pH of a 0.200 M solution ofHF.a)0.70b)1.17c)1.93d)3.17e)7.00
2.At a temperature where Kwis 1.4 x 10−13, a solution has a pH of 7.00.What is true of this solution?(circle all that apply)C.
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3. A 0.00100 M solution of lactic acid is prepared in ultrapure water. From high precision conductivitymeasurements, the acid is found to be 30.90 % ionized. What is the Kafor lactic acid?
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4.A buffer is to be prepared using acetic acid and sodium acetate to a target pH = 5.10.What ratio of theconjugate−base to conjugate−acid must be used to achieve this pH?Kafor acetic acid is 1.75 x 10−5.9.80
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5. At equilibrium in a reaction, which of the following statements must be true?a)the rate of the forward reaction has reached a maximumb)no reaction is occurringc)the rate constants of the forward and reverse reactions must be equald)there are more products than reactantse)there is no net change in the amount of any reactant or product