Exam+5_FINAL - CHEM 1310 G Professor Azizi Fall 2007 Name...

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CHEM 1310 G Name:_________________________ Professor Azizi Fall 2007 Date:______________________ Each question is worth 5 points. Please circle the correct answer. No partial credit will be given and no CRIB sheets allowed. 1. A solution contains 0.450 M HA ( K a = 2.0 x 10 -7 ) and 0.250 M NaA. Calculate the pH after 0.050 mole of NaOH is added to 1.00 L of this solution. a) 6.30 b) 6.44 c) 6.57 d) 6.70 e) none of these 2. Calculate the [H + ] in a solution that is 0.10 M in NaF and 0.20 M in HF. ( K a = 7.2 × 10 –4 ) a) 0.20 M b) 7.0 × 10 –4 M c) 1.4 × 10 –3 M d) 3.5 × 10 –4 M e) none of these 3. Buffers in the human body a) help to maintain a constant blood pH. b) help to keep the body temperature constant. c) help change the blood plasma pH when foods are eaten. d) precipitate proteins so enzymes are inactive. e) none of these
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CHEM 1310 G Name:_________________________ Professor Azizi Fall 2007 Date:______________________ 4. You are given a solution of the weak base Novocain, Nvc. Its pH is 11.00. You add to the solution a small amount of a salt containing the conjugate acid of Novocain, NvcH + . Which statement is true? a) The pH and the pOH both increase. b) the pH and the pOH both decrease. c) The pH and the pOH remain unchanged. d) The pH increases and pOH decreases. e) The pH decreases and the pOH increases. 5. For ammonia, K b is 1.8 x 10 -5 . To make a buffered solution with pH 10.0, the ratio of NH 4 Cl to NH 3 must be a) 1.8 : 1 b) 1 : 1.8 c) 0.18 : 1 d) 1 : 0.18 e) none of these 6. Methyl orange is an indicator with a K a of 1 × 10 –4 . Its acid form, HIn, is red,
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This note was uploaded on 05/07/2008 for the course CHEM 1310 taught by Professor Cox during the Fall '08 term at Georgia Tech.

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Exam+5_FINAL - CHEM 1310 G Professor Azizi Fall 2007 Name...

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