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Consider the case of strontium carbonate, a salt that is only sparingly-soluble in water. SrCO3(s) equilibrium reaction arrow Sr2+(aq) + CO32−(aq). Describe how the solubility of strontium carbonate is affected by the addition of HCl. The addition of HCl to the solution (increase/decrease) the concentration of hydronium ions (H3O+), therein lowering the solution's pH. The hydronium ions consume the carbonate anion (CO32−), pushing the equilibrium to the (left/right). Equliburm shift (+ or -)