What are strong and weak acids? In the following list of acids, separate strong acids from weak acids: Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.

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In aqueous solutions, strong acids ionise completely and provide hydronium ions. On the other hand, weak acids are partially ionised and an aqueous solution of same molar concentration provides a much smaller concentration of H3O+ ions. 

Strong acids Hydrochloric acid, sulphuric acid, nitric acid. 

Weak acids-Citric acid, acetic acid, formic acid.

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