Double Replacement Reaction

A double replacement reaction is a chemical reaction where two compounds exchange positive ions with each other to form two new compounds. It can be represented by the general chemical equation:

AB + CD → AD + CB

Where A and C are cations and B and D are anions.

Example

An example of a double replacement reaction is the reaction between silver nitrate (AgNO3) and sodium chloride (NaCl) to form silver chloride (AgCl) and sodium nitrate (NaNO3):

AgNO3 + NaCl → AgCl + NaNO3

Key Points to Remember

• Double replacement reactions occur between compounds in aqueous solutions.
• The cations and anions in the reactants switch partners to form new compounds.
• Double replacement reactions often result in the formation of a precipitate (solid) or a gas.
• The net ionic equation for a double replacement reaction only includes the ions that participate in the reaction.

Study Guide

When studying double replacement reactions, it's important to understand the following concepts:

1. Identifying the cations and anions in compounds.
2. Understanding solubility rules to predict whether a precipitate will form in a double replacement reaction.
3. Balancing chemical equations for double replacement reactions.
4. Writing net ionic equations to represent the ions involved in the reaction.

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