Discussion exp4 - James Riddle jr39592 Experiment 4...

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James Riddle jr39592 Experiment 4 – Qualitative Analysis and Precipitation Reactions Desai, K The objectives of this experiment were to develop a scheme for the qualitative analysis of three specific cations, to separate the three cations and determine the unknown solution, and to learn the solubility rules that determine the solubility of salts. (1) It was necessary to add 6M HCl because the cations needed to be separated and when combined with HCl, all three are insoluble. If too much excess 6M HCl is added then silver chloride and lead (II) chloride tend to form soluble complexes. Another drop of 6M HCl was added to the solution because the completion of the precipitation of all three cations needed to be ensured. (2) Lead (II) chloride is much more soluble in warm water, therefore the solution was heated to separate the lead (II) chloride from the silver chloride and mercury (I) chloride. Potassium chromate was then added to the solution with only lead (II) chloride dissolved in it which formed lead (II) chromate, a yellow precipitate. A yellow precipitate
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This note was uploaded on 07/17/2011 for the course CH 204 taught by Professor Leytner during the Fall '08 term at University of Texas at Austin.

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Discussion exp4 - James Riddle jr39592 Experiment 4...

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