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Consider CaSO4 as representing the noncarbonate hardness of calcium species.

This ionizes as CaSO4 ^ Ca + SO4 ; thus, the equivalent mass of calcium in the noncarbonate hardness of calcium is Ca/2. The calcium not precipitated therefore jmgnot = 50.0 [MTCa (1 - f^W] milligram produces [Ca2+]mgn+ot/(Ca/2) = 0.050[Ca2+]m equivalents of Ca2+.

Summing all the calcium ion concentrations, the total concentration [Ca jm is

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