qualitativeana2

qualitativeana2 - 1 Sarah Haddaoui Biology Sci Writing...

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1 Sarah Haddaoui Biology Sci Writing Introduction: Qualitative analysis is used in the determination of the identity of a substance. It is different from quantitative analysis, which deals with the determination of the amount of a substance. In this experiment, qualitative analysis techniques were used to determine whether or not a sample contains a certain ion. When using this method, an unknown and a reactant were mixed. The result of the reaction led to a conclusion about the presence or absence of certain ions in the unknown. Many ions react in similar ways, and although the addition of one reagent to an unknown may not identify the ion, it limits the possibilities as to what the ion could be. For this experiment, the unknown contained all of the following cations and anions: Ag + , Cl - , Ba 2+ , SO 4 2- , Fe 3+ , PO 4 3- , Cu 2+ , and Cr 3+ . The following reagents were used to identify the ions: 1M H 2 SO 4 , 2M HCl, 2M NH 4 OH, 2M NaOH, .1M Ba(NO 3 ), .1M AgNO 3 (labeled as .1M Ag + ). The first four were used to identify the cations, and the last two, used in conjunction with the first four, were used to identify the anions. The identification of the ions was mainly based on solubility. That meant that something must have been known about the solubility characteristics of the different ions in the presence of the available reagents. The point of the experiment was to learn which reagents would cause the ions to form precipitates, and which reagents dissolve the precipitates formed by the ions.
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2 Materials and Method: Figure 1.1
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3 Figure 1.2 The first part of the experiment consisted of reacting the cations and anions with the reagents in order to see what the reaction will result in (precipitate or no precipitate). The cations were each reacted with the first four reagents listed in the introduction
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This note was uploaded on 04/08/2011 for the course MKT 350 taught by Professor Hannah during the Spring '11 term at Suffolk.

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qualitativeana2 - 1 Sarah Haddaoui Biology Sci Writing...

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