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An irreversible reaction is one in which the entire amount of a reactant or all of

them are converted into products.

They proceed only in the forward direction and an arrow pointing to the products

is placed between reactants and products in the reaction equation.

A chemical reaction becomes irreversible when one of the products leaves the

homogeneous system where the reaction takes place.

e.g.

suppose A and B are the reactants, and C and D are the products. The

reaction takes place in liquid phase.

If one of the products precipitates (appears as an insoluble solid), or is a liquid

that is not miscible with the reactant liquid phase, or is a gas that comes out of

solution, then we have an irreversible reaction.

Reversible reaction A + B ↔ C + D

Irreversible reaction A + B → C + D↓ (D precipitates out of solution)

A + B → C + D↑ (D bubbles out of solution)

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