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Determination of magnesium ions: colorimetric titration

To determine Mg2+ concentration, several methods can be considered:

  1. From water hardness (Ca2+ + Mg2+) and Ca2+ concentration obtained by a complexometric / colorimetric titration.
    n(Mg2+) = n(Ca2+ + Mg2+) - n(Ca2+)
  2. By reflectometry.
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