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There is no such acid which is both strong and weak. An acid is either weak or it is strong.

However, sulfuric acid as a diprotic acid is a strong acid in its first dissociation.

H2SO4 --> H+ + HSO4-

and is a weak acid in its second dissociation

HSO4- --> H+ + SO42-

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It is a strong acid only for the first hydrogen ion that is produced.

(1) H2SO4 --> H+ + HSO4^-

The remaining bisulfate ion, HSO4^-, is a weak acid and only partially dissociates.

(2) HSO4^- <==> H+ + SO4^2-

A misconception is that since sulfuric acid is a strong acid, that it dissociates like this:

(3) H2SO4 --> 2H+ + SO4^2-

That simply isn't the case except for extremely dilute solutions. As the concentration of the acid decreases, the acid behaves more and more like a strong diporotic acid. At "infinite dilution" it is accurate to write the dissociation as equation (3).

Read more: http://wiki.answers.com/Q/Is H2SO4 a strong acid or weak acid#ixzz2TQB85UJp

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