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A 1L of well water which consists of magnesium was made basic with KOH, which precipitated most of the magnesium as magnesium hydroxide. The product

A 1L of well water which consists of magnesium was made basic with KOH, which precipitated most of the magnesium as magnesium hydroxide. The product was then titrated with 20,21 mL of 0,01123 M EDTA using a culminate indicator, which is the EDTA indicator. Calculate the water hardness in terms of MgSO4 in ppb.

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