How Are Sandstone And Siltstone Different

Jan 25,  · Divide the molar mass by the ion charge or oxidation number (for CaCO3) to determine equivalent (Eq.) weights. Eq. weight (HCO3 (-)) = 61 / 1 (charge) = 61 g/Eq. Eq. weight (CO3 (2-)) = 60 / 2.