lab 3 - Q# Question Text 4) Scoring Scheme: 3-3-2-1 Part I....

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Q# Question Text 4) Scoring Scheme: 3-3-2-1 Part I. You considered the equilibrium: Fe 3+ (aq) + SCN - (aq) Fe(SCN) 2+ (aq), and compared the color of the solutions in four test tubes. In the first test tube, you added 1.0 mL of 0.1 M Fe(NO 3 ) 3 .
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What color change was observed and what did this color change indicate about the shift in equilibrium? Your Answer: d. The solution turned deep red indicating that the equilbrium shifted to the right decreasing [Fe 3+ ] and [SCN - ], as well as, increasing the [Fe(SCN) 2+ ]. You Scored 3 points out of 3 Possible 5) Scoring Scheme: 3-2-1-1 Part I. You considered the equilibrium: Fe 3+ (aq) + SCN - (aq) Fe(SCN) 2+ (aq), and compared the color of the solutions in four test tubes. In the first test tube, you added 1.0 mL of 0.1 M Fe(NO 3 ) 3 . How do you explain the shift in equilibrium in terms of LeChatelier's Principle? Your Answer: b. The addition of Fe(NO 3 ) 3 increased the concentration of Fe 3+ . To reduce the stress of the added Fe 3+ and to re-establish equilibrium, the system shifted to the right decreasing [Fe 3+ ] and increasing the [Fe(SCN) 2+ ]. Increasing the [Fe(SCN) 2+ ] produced a deep red color. You Scored 3 points out of 3 Possible 6) Scoring Scheme: 3-3-2-1 Part I. You considered the equilibrium: Fe 3+ (aq) + SCN - (aq) Fe(SCN) 2+ (aq), and compared the color of the solutions in four test tubes. In the second test tube, you added 1.0 mL of 0.1 M KSCN. What color change was observed and what did this color change indicate about the shift in equilibrium? Your Answer: d. The solution turned deep red indicating that the equilbrium shifted to the right decreasing [Fe 3+ ] and [SCN - ], as well as, increasing the [Fe(SCN) 2+ ]. You Scored 3 points out of 3 Possible 7) Scoring Scheme: 3-2-1-1 Part I. You considered the equilibrium: Fe 3+ (aq) + SCN - (aq) Fe(SCN) 2+ (aq), and compared the color of the solution in four test tubes. In the second test tube, you added 1.0 mL of 0.1 M KSCN. How do you explain the shift in equilibrium in terms of LeChatelier's Principle? Your Answer: c. The addition of KSCN increased the concentration of SCN - . To reduce the stress of the additional SCN - and to re-establish equilibrium, the system shifted to the right decreasing [SCN - ] and increasing the [Fe(SCN) 2+ ]. Increasing the [Fe(SCN) 2+ ] produced a deep red color. You Scored 3 points out of 3 Possible 8) Scoring Scheme: 3-3-2-1 Part I. You considered the equilibrium: Fe 3+ (aq) + SCN - (aq) Fe(SCN) 2+ (aq), and compared the color of the solutions in four test tubes. In the third test tube, you added 6 M NaOH dropwise. What changes were observed and what did these changes indicate about the shift in equilibrium? Your Answer: a. The formation of a precipitate occurred and the solution turned yellow indicating that the equilbrium shifted You Scored 3 points out of 3 Possible
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to the left increasing [Fe 3+ ] and [SCN - ], as well as, decreasing the [Fe(SCN) 2+ ]. 9)
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This note was uploaded on 02/09/2010 for the course CHEM 35985 taught by Professor Osterloh during the Spring '10 term at UC Davis.

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lab 3 - Q# Question Text 4) Scoring Scheme: 3-3-2-1 Part I....

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