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Acids like sulphuric acid are termed bibasic, and their equivalent is only half the molecular weight.

Similarly, lime and most of the bases are bibasic, as may be seen from the following equations; hence their equivalent will be half the molecular weight.        2HCl + CaO = CaCl2 + H2O.        2HCl + MgO = MgCl2 + H2O.