question about weak and strong acid (identiflying )

All of hydrochloric acid, sulphuric acid and nitric acid are strong acids.

This is because all of them are completely ionized in water to give hydrogen ions.
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2008-06-06 23:03:08 補充：
All strong acids are completely ionized in water. Therefore, their strengths cannot be compared when water is used as the solvent.

However, if a solvent other than water is used, the strengths of strong acids could be compared. For example, the acidity in ethanoic acid : H2SO4 > HCl > HNO3