An irreversible reaction is a reaction that tends to completion. When a strong acid added to water, the reaction is irreversible.
In chemistry, a reaction may be reversible or irreversible. In a reversible reaction, the reaction could move forward or backwards. An irreversible reaction only tends towards completion. It doesn't goes in the reverse direction.
When a weak acid or base is added to water, the reaction is reversible because the substance does not ionize to a large extent in water and the equilibrium position may lie towards the far left. However, a strong acid or base achieves 100% ionization in water hence the reaction is irreversible.
Therefore, when a strong acid added to water, the reaction is irreversible.
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