Gravimetric Analysis

Topics: Chemistry, Solubility, Molecule Pages: 2 (513 words) Published: October 6, 2012
The purpose of experiment 1, also named Gravimetric Analysis, is to study the use of analytical chemistry. Analytical chemistry is a branch of chemistry that involves determining what matter is and how much of it exists. It is the science of separating, identifying, and determining the components that make up a compound and determining a specific amount of that compound. There are two types of analytical chemistry: qualitative and quantitative. This experiment uses quantitative analysis to determine the amount of a substance, or several species, and measure it in numerical terms. More specifically, this experiment uses gravimetric analysis, a form of quantitative analysis that uses an analytical balance, an instrument that yields accurate and precise data, to measure the masses of several substances.

Experiment 1 involves the precipitation of a complex compound called aluminum 8-hydroxyquinilinate, also called Alq3. In order for this precipitation to occur, an organic precipitating agent, 8-hydroxyquinilinate (abbreviated OxH) is used to react with aluminum ions to form this complex compound. For this reaction to take place, OxH must be deprotonated, so that its anion, Ox-, will bond with the aluminum ions (the OxH molecule itself will not react with aluminum ions). As a result, the pH of the solution has a major effect on the precipitation in this experiment. If the pH is too low and there is an excess of hydrogen ions, then by Le Chatelier’s principle, the equilibrium will shift to the left, creating more OxH molecules. Ox- will no longer be available and a precipitation will not occur. If the pH is too high and there is an excess of hydroxide ions, the aluminum ions will react with the hydroxide ions. There will be no aluminum to react in the precipitation. If the pH is neutral, OxH is not very soluble and may cause it to precipitate out itself. So in order for this precipitation in this experiment to take place, it is vital that a buffer solution of...
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