SampleExam2

SampleExam2 - Name (print) Chemistry 142 Exam #2 SAMPLE FOR...

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Name (print) Chemistry 142 Exam #2 SAMPLE FOR FULL CREDIT ON CALCULATIONS YOU MUST SHOW ALL WORK ! GOOD LUCK! (13) 1. What is the conjugate base of HAsO 4 2– ? What is the K b for the conjugate base of HAsO 4 2– ? What is the conjugate acid of HAsO 4 2– ? What is the K a for the conjugate acid of HAsO 4 2– ? (19) 2. A solution has [H + ] = 3.9 x 10 –8 M . Determine its pH, pOH, and [OH ]. pH pOH [OH ] This solution is (circle one): acidic basic neutral (18) 3. Circle all of the solutions below that can act as a buffer. (A) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 1.0 M sodium hydroxide (B) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 0.6 M sodium hydroxide (C) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 1.0 M hydrochloric acid (D) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 0.6 M hydrochloric acid (E) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 1.0 M sodium cyanide (F) 50.0 mL 1.0 M hydrocyanic acid plus 50.0 mL 0.6 M sodium cyanide
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(42) 4. (a) Calculate the pH and percent dissociation for 2.00 L of a 0.255
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This note was uploaded on 02/09/2010 for the course CH CH242 taught by Professor Katz during the Spring '10 term at Colby.

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SampleExam2 - Name (print) Chemistry 142 Exam #2 SAMPLE FOR...

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