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Chemical Reactions Prelab

Chemical Reactions Prelab - Chem 130 Exp 5 Chemical...

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Chem 130 Exp 5: Chemical Reactions This lab will provide training and practice in two important chemistry laboratory skills: making detailed qualitative observations of experiments and writing accurate chemical equations for reactions. We will be performing two major types of chemical reactions in this lab. Precipitation Reactions: A precipitation reaction is one in which two solutions containing ions are mixed and a new compound having low solubility in water is formed and comes out of solution as a solid (precipitate.) For example, suppose a solution of AgNO 3 is mixed with a solution of NaCl. This reaction has the pattern of a double displacement reaction , which means the cations of each ionic compound trade ionic partners—the general formula of a double displacement reaction is AB + CD AD + CB. In the example we are looking at, Ag + ( aq ) trades ionic partners with Na + ( aq ), forming AgCl and NaNO 3 . If we look in a table of solubility rules (see your text) we find that most chloride salts are insoluble, so AgCl( s ) will precipitate from the solution; however, most sodium and most nitrate salts are soluble, so NaNO 3 ( aq ) will remain in the solution. A molecular equation is an equation in which the reactants and products are represented in their molecular forms in solution (even if their actual form is the ionic form). The molecular equation for this reaction is: AgNO 3 ( aq ) + NaCl( aq ) — AgCl( s ) + NaNO 3 ( aq )
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