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As Dr. Lavelle depicted in class, the arrow in the chemical equation for any reaction involving a strong acid or a strong base is simplified as being one arrow because of the overwhelming skew it has to one side of the reaction. This does not mean that the reverse reaction is not occurring, but only that it is occurring at a much lesser rate.
The equilibrium arrows should be used for all reactions in equilibrium, no matter if it is a strong or weak acid or base. However, if the reaction favors one side, the products or the reactants, than the lengths of the arrows become skewed in the respective directions.
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