Why 1/2 mole H2SO4 means 1 gram equivalent of it ?
The concept of Equivalent mass comes from acid-base neutralization reactions. Not all acids are the same. Some have more protons to donate than others do. Molar mass or Formula mass is based upon the Molecular or Formula weight (mass) of the compound. The Equivalent mass is the Molecular or Formula mass divided by the number of acidic hydrogens in the acid. Since Sulfuric acid (H2SO4) has two acidic hydrogens, then the Equivalent mass is the Molecular mass divided by two. If given in terms of grams, this is one gram equivalent.
