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How to Tell if an Acid is Strong or Weak

I need a simple way of telling if an acid is strong or weak (by looking at the formula). I need the same explanation for bases.

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There are some simple rules that you can use to tell if a compound is a strong or weak acid or base. However, they are only guidelines, so use your common sense when applying them.

There are only six strong acids in aqueous solution:

hydrochloric acid ...