The picture on the right is part of the label of "Master Kong" brand drinking mineral water. Please read the label carefully and calculate:

According to the meaning of the question, the maximum amount of magnesium ion is 4.9mg/L

, which is equivalent to 4.9X1-3/24 mol/L = 2.4x1-4 mol/L

. The maximum value of sulfate is 19.5mg/L =19.5x1-3g/L, and the maximum molar concentration is 19.5x1-3/96=2.3x1-4 mol/L

. Magnesium sulfate can also be added according to the meaning of the question, so the concentration of magnesium ion should be equal to that of sulfate, and the maximum concentration of magnesium ion can be obtained, or the maximum concentration of sulfate can be obtained directly without calculation.