Pre-Lab Quiz 6

Pre-Lab Quiz 6 - 2 E 587 mL HNO 2 413 mL KNO Question 3 For...

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http://chemmac1.usc.edu/cttccgi/randquiz.cgi 1 of 2 Web Quiz You can login to this page multiple times but you cannot take the quiz more than once. . Submit your answer for grading by Clicking on the "Grade Answers" button at the bottom of the page only when you are sure of your answers. Question # 1 Calculate the [H + ] in a solution that is 0.10 M in NaF and 0.20 in HF. ( K a = 7.2 x 10 -4 ) A. 0.20 M B. 7.0 x 10 -4 M C. 1.4 x 10 -3 M D. 3.5 x 10 -4 M E. none of these Question # 2 You have solutions of 0.200 M HNO 2 and 0.200 M KNO 2 ( K a for HNO 2 = 4.00 x 10 -4 ). A buffer of pH 3.000 is needed. What volumes of HNO 2 and KNO 2 are required to make 1 liter of buffered solution? A. 500 mL of each B. 286 mL HNO 2 ; 714 mL KNO 2 C. 413 mL HNO 2 ; 587 mL KNO 2 D. 714 mL HNO 2 ; 286 mL KNO
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Unformatted text preview: 2 E. 587 mL HNO 2 ; 413 mL KNO Question # 3 For a solution equimolar in HCN and NaCN, which statement is false? http://chemmac1.usc.edu/cttccgi/randquiz.cgi 2 of 2 A. This is an example of the common ion effect. B. The [H + ] is larger than it would be if only the HCN was in solution. C. The [H + ] is equal to the K a . D. Addition of more NaCN will shift the acid dissociation equilibrium of HCN to the left. E. Addition of NaOH will increase [CN-] and decrease [HCN]. Question # 4 For ammonia, K b is 1.8 x 10-5 . To make a buffered solution of 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 Grade Answers...
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This note was uploaded on 08/21/2008 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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Pre-Lab Quiz 6 - 2 E 587 mL HNO 2 413 mL KNO Question 3 For...

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