Double Replacement Reaction

Double Replacement Reaction is a type of chemical reaction where two ionic compounds exchange anions to produce two new compounds. The general form of double replacement reaction is

The general  form above shows the exchange of ions of the two compounds AX and BZ where A paired with Z forming AZ and B paired with X forming BX..  It is understood that A is a positive ions and should be paired with Z which is negatively charged ions.  Same with the second compound formed B is positive ion and should be paired with the negative ions X.

The second equation above shows that there is an exchange of ions between compounds in aqueous solution. Aqueous solution means that the compound is dissolved in water. Reaction comes into completion only when there is a formation of precipitate or a formation of  insoluble salts as shown in the equation above.  But if both compounds are soluble in water then there is no reaction, meaning both products formed aqueous solution.

In order to predict if an ionic compound is soluble or insoluble use Solubility Rules.

Example:

The example above shows that reaction is possible due to the formation of insoluble precipitate 

Observe the next example:

The above example shows that both possible products are soluble in water, therefore there is no reaction between the two reactants.  Final answer will be: 

Neutralization Reaction is a special kind of double replacement reaction.  This reaction involves the reaction between an acid and a base forming a salt and water.

Example:  

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