s10q07 - 1. Chem 171 Quiz 7 Version A In the experiment...

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Chem 171 Quiz 7 Version A 1. In the experiment entitled “Physical Separation of Ternary Mixture”, describe with two chemical reactions, what you observed, when you tested Cu 2+ with ammonia? Light blue solution goes to a light blue precipitate upon addition of 4 drops of NH 3 (aq) . The amount of precipitate increases with a few more drops of NH 3 (aq). Cu 2+ (aq) + 2OH (aq) Æ Cu(OH) 2 (s) Upon addition of excess aqueous ammonia, precipitate disappears and solution turns dark blue. Cu(OH) 2 (s) + excess NH 3 (aq) [Cu(NH 3 ) 4 ] 2+ (aq) 2. The following questions refer to the experiment entitled ”Volumetric Analysis: An Acid- Base Titration”: What is the primary standard that you use in this experiment? Define a primary standard. Oxalic Acid Dihydrate H 2 C 2 O 4 • 2H 2 O A primary standard is any highly stable substance whose purity is extremely high from which we can determine the concentration of another solution. Chem 171 Quiz 7 Version B 1. The following questions refer to the experiment entitled “The Physical Separation of a Ternary Mixture”. What is dry ice?
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This note was uploaded on 03/08/2011 for the course CHEM 171 taught by Professor Several during the Spring '08 term at Rutgers.

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s10q07 - 1. Chem 171 Quiz 7 Version A In the experiment...

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