Types Of Chemical Reactions With Decomposition And Combustion

1178 Words Dec 17th, 2014 null Page
Precipitation reaction, or otherwise known as double-replacement reaction, is one of the three common types of chemical reactions along with decomposition and combustion. A simple definition for the precipitation reaction would be “atoms from two different compounds switch places” (Lew 40). This means that one of the reactant’s molecule “trades” places with another from another compound to form products, like a precipitate, hence the term double-replacement. A precipitate is usually a solid insoluble product of a reaction, compared to the other soluble aqueous molecules in the formula. Its creation is what characterizes precipitation reactions since it is what the reaction is named after. The precipitates can look like a powdery or gel-like mass, and if “it is floating in liquid, then it can be specifically called a ‘suspension’” (Walker 21). An example is shown below to clarify how a precipitation reaction might look like:
3〖Ag〗_2 〖So〗_(4 ) (aq) + 2〖AlCl〗_3 (aq) -> 6AgCl (s) + 〖Al〗_2 (〖So〗_(4)3 )(aq)
Compound compound different different compound/ compound precipitate
As one can see from above, there is one (s) which stands for solid and three (aq)s which represents a shorthand version of aqueous. The solid is the only compound that will not dissolve in the solution; this is due to the combination of its cation and anion. The precipitates are produced when compounds contain insoluble anions such as sulfide, hydroxide, phosphate, and carbonate…

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