Qualitative Analysis The Chemical Compounds - 1912 Words

QUALITATIVE ANALYSIS CHMY 141-018 TA: Casey Kennedy 10/28/15 Introduction In many cases, scientists don’t often have all the details when performing experiments, and there is almost always some aspect that is unknown. In certain scenarios, a chemist may not know what elements or compounds are present in a specific sample, so they must be able to recognize properties characteristic of certain elements and compounds, to determine their presence in the unknown sample. When working with unknown ions, it is often best to use known solubility rules to manipulate, separate, and identify the unknown ions present in a sample. In practice, this usually involves using specific reagents to cause some of the ions to fall out of solution as a solid precipitate, then separating the ions in the precipitate from the ions remaining in solution that are soluble with the specific reagents used. This process is repeated, causing ions to separate either by dissolving them in solutions that they are soluble in, or causing them to form insoluble compounds and fall out of s olution as a solid precipitate until the ions have been isolated from each other. Once isolated, the ions are then treated with compounds which react in a distinct manner with specific ions, allowing their identities to be confirmed. In the first portion of this experiment ions are mixed in spot tests with separate reagents, specifically to observe and record the reaction that occurs. 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