Chem_171_Su_08_Q7_TernMix_Chrom_Key_Posted-977

Chem_171_Su_08_Q7_Te - 1 Chem 171 Quiz 7 Version A An aqueous solution of Cu2 is light blue To test for the presence of the Cu2 ion we add aqueous

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Chem 171 Quiz 7 Version A 1. An aqueous solution of Cu 2+ is light blue. To test for the presence of the Cu 2+ ion we add aqueous NO 2 - . Write the chemical equation that shows the reaction between the complex ion of Cu 2+ formed in water (i.e., [Cu(H 2 O) 6 ] 2+ ) and NO 2 - resulting in a complex ion with a charge of 2 - . Show the states. [Cu(H 2 O) 6 ] 2+ (aq) + 4 NO 2 - (aq) [Cu(NO 2 ) 4 ] 2- (aq) + 6H 2 O(l) 2. Explain why separation occurs in chromatography? (5 pts) A mixture of solutes in a mobile phase pass through a selective adsorbing medium, the stationary phase. As the mobile phase (a gas or a liquid) migrates through the stationary phase, separation occurs because the solutes have different affinities for the two –phased system, made of the mobile and stationary phases. This difference in affinities results in the separation of the solutes . Chem 171 Quiz 7 Version B 1. In the laboratory, a student is given two unknown solids, KCl and NaCl. How would you identify the two compounds. Give details.
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This note was uploaded on 01/20/2009 for the course CHEM chem 171 taught by Professor Siegal during the Spring '09 term at Rutgers.

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Chem_171_Su_08_Q7_Te - 1 Chem 171 Quiz 7 Version A An aqueous solution of Cu2 is light blue To test for the presence of the Cu2 ion we add aqueous

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