An industrial chemist monitors the rate of corrosion of zinc plates. They observe that zinc corrodes much more slowly in a 0.5 mol dm-3 solution of sulfurous acid (H2SO3H_2SO_3H2SO3) than in a 0.5 mol dm-3 solution of sulfuric acid (H2SO4H_2SO_4H2SO4).
This difference arises because sulfurous acid is a weak acid.
Explain the meaning of the term weak acid.
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