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QUESTION

# Are acid-base reactions always double displacement?

In order for the reactions to take for a double displacement, there needs to be two reactants, which in turn will yield two products.

The basic reaction for a double replacement react takes the following format:

AB+CD→CB+AD

In the case of the the acid-base reaction, the reactants are an acid and a base.

Let's look at an example

Aqueous hydrochloric acid reacts with sodium hydroxide which will yield aqueous sodium chloride and water

HCl(aq) + NaOH(aq) --> NaCl(aq) + H_2O (l)

In a reaction between an acid and a base the typical outcome is a salt formed by the positive ion from the base and the negative ion from the acid.

In this case the positive potassium ion (Na^+) and the negative chorine ion from hydrochloric acid (Cl^-) to form the salt  NaCl

The positive hydrogen (H^+) from the acid and the negative hydroxide ion (OH^−) from the base form the water  HOH or  H_2O

So to answer your question, Yes, acid-base reactions will always be double displacement, but they are commonly known as a special double displacement reaction called, Neutralization reaction