Differentiate the following. An equivalent in acid-base reaction and an equivalent in oxidation-reduction reaction

PLACEHOLDER ANSWER - the answer is a comparison. In an acid-base reaction, one equivalent is the amount of substance that gives or reacts with one mole of $$\text{H}^+$$ (or $$\text{OH}^-$$), so the equivalent mass is the molar mass divided by the basicity or acidity. In a redox reaction, one equivalent is the amount that gains or loses one mole of electrons, so the equivalent mass is the molar mass divided by the change in oxidation number per formula unit. For example $$\text{KMnO}_4$$ in acid ($$\text{Mn}$$ from $$+7$$ to $$+2$$) has equivalent mass $$\frac{158}{5}$$.