Question

is an acid -base reaction a double decomposition reaction

Answer 1

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)+H2O(l)

In a neutralization 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 HOHor H2O

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

Answer 2

Yes acidbase reaction is also known as neutralization reaction it is the part of the decomposition reaction so airbase reaction is a double decomposition reaction