scheme assignment 2

scheme assignment 2 - Muhammad Jaffer 2/17/11 TA: Tao Chen...

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Muhammad Jaffer 2/17/11 TA: Tao Chen Signature of Approval:_______________ Scheme of Analysis: Assignment 2 Possible Cations: Na + , K + , NH 4 + Possible Anions: HO - , Cl - , NO 3 - , SO 4 2- , HSO 4 - I. Description of the Sample Take note of phase, color, odor, shape, and solubility. Indicate as well whether the salt appears to be a mixture. If so, homogenize the sample, because it is necessary that all the sample species are present in solution while conducting quantitative analysis. II. Tests to be Done Before Preparation of the Solution 1. Flame Test 1. If an orange flame is produced, then Na + is present in the sample, K + and NH 4 + should NOT be ruled out as possible constituents though (understand the difference between a positive and negative flame test for Na + ). 2. If a purple flame is produced, then K + is present in the sample. Na + can be ruled out as absent in the original sample, because a purple flame would not be visible if Na + was a principal species in the sample. NH 4 + may or may not be present in the solution though. Further tests would need to be carried out to determine its presence in the sample III. Tests Involving the Formation of Solution
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This note was uploaded on 03/31/2011 for the course CHM 2051 taught by Professor Staff during the Spring '08 term at University of Florida.

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scheme assignment 2 - Muhammad Jaffer 2/17/11 TA: Tao Chen...

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