What is the gEq weight of an acid?

a. Amount of the acid containing 1 mol of replaceable H+ ions.
b. Amount of the acid containing 1 mol of replaceable OH? ions.
c. Gram atomic weight of the acid times its valence.
d. Milligrams of acid per deciliter (dl) of normal solution.

ANS: A
The gram equivalent weight of an acid may be calculated by dividing its gram formula weight by the number of hydrogen atoms in its formula, as shown in the following reaction:
The single H+ of hydrochloric acid (HCl) is replaced by Na+. One mole of HCl has 1 mol of re-placeable hydrogen. By definition, the gEq of HCl must be the same as its gram formula weight, or 36.5 g.

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