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Unformatted text preview: Chem 1202 Exam G G RT ln Q R 8.314 J/mol K 1 The weak acid HA has a pH of 3. 637 when the concentration is 0.058 M. What is the K a of this acid? ( A ) 9. 217 10 " 7 ( B ) 5. 1 10 " 7 ( C ) 1. 652 10 " 6 ( D ) 5. 354 10 " 6 ( E ) 2. 974 10 " 6 2 Which of the following salt solutions will be the most basic? ( A ) LiI ( B ) CaO ( C ) NH 4 C l ( D ) KBr ( E ) Ca NO 3 2 3 When an equal number of moles of NaOH is added to each of these acids the pH of the resulting mixture will be 7.0 Which acid is an exception to this rule? Hint: Write the formulas for the acids and think about what species will be present after equal moles of acid react with NaOH. ( A ) sulfuric acid ( B ) perchloric acid ( C ) hydrochloric acid ( D ) nitric acid ( E ) hydrobromic acid 4 100.0 mL of 0.1M NH 4 C e is titrated with 40.0 mL of 0.25M NaOH to the equivalence point. Which of these statements best describes the conditions at the equivalence point of this titration? ( A ) The pH is neutral because of the products C e " and water ( B ) The pH is basic because of the product NH 3 ( C ) The pH is acidic becasue of the excess NH 4 ( D ) The pH is acidic because of the product NH 2 " ( E ) The pH is basic because of the excess NaOH...
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- Spring '08