Equivalents express the combining power of an element for example what mass of an element can combine with or displace one gram of hydrogen or eight grams of oxygen.
Since Mg is divalent, one gram of Mg2+ can combine with 2 grams of hydrogen
Therefore, 0.6 mole of Mg2+ can combine with 0.6 x 2 = 1.2 moles of hydrogen
Hence there are 1.2 equivalents in 0.60 mole of Mg2+
For balancing acidic solutions, we would need to add H+ ions to the correct side of the equation to balance the total number of atoms and the overall charge.
