The tutor defines equivalent weight in the context of acids and bases.

An equivalent weight of an acid is the mass that yields one mole of H⁺ ions. Similarly, an equivalent weight of a base is the mass that yields one mole of OH^– ions.

Example:

Find the mass of three equivalent weights of H₂SO₄.

Solution: The molar mass of H₂SO₄ is 98g, but that yields two moles of H⁺ ions. Therefore, an equivalent weight of H₂SO₄ is 49g. Three equivalent weights is 3*49g = 147g.

By way of comparison, the molar mass of HCl is 36.5g, and one mole supplies one mole H⁺ ions. Therefore, three equivalent weights of HCl is 3×36.5g = 109.5g.

Source:

Mortimer, Charles E. Chemistry, 6th ed. Belmont: Wadsworth, 1986.

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