How do you calculate the epm for SO4?

To calculate the equivalent weight (epm) for sulfate (SO₄²⁻), first determine its molecular weight, which is approximately 96 g/mol. Since sulfate has a charge of -2, the equivalent weight is calculated by dividing the molecular weight by the number of moles of electrons transferred in a reaction, which in this case is 2. Thus, the equivalent weight (epm) for SO₄²⁻ is 96 g/mol ÷ 2 = 48 g/eq.