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Magnesium carbonate is slightly soluble in water. The Ksp for MgCO3 is 3.5 x 10-8. The carbonate ion being a conjugate base may form the bicarbonate ion (hco3) and carbonic acid (h2co3) in solution. Which of the following represents the correct mass balance equation at a ph of 7.5 for this system?

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The correct mass balance equation for MgCO3 at pH 7.5 considers the following species: Mg2+, CO32-, HCO3-, and H2CO3. Since the pH is 7.5, we can assume that [HCO3-] ≈ [CO32-] (due to the buffering effect of the HCO3-/CO32- system). Therefore, the mass balance equation is: [Mg2+] = [CO32-] + [HCO3-] + [H2CO3]

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