Analysis of a spring water

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Determination of calcium ions: complexometric/colorimetric titration


Procedure

  • Collect 10 mL of the water to be analyzed and transfer it to a 25 mL beaker.
  • Add 3 mL of pH 12 buffer solution under an extraction hood and a spatula tip of CAL. The solution takes on a red-purple color.
  • Titrate the solution with EDTA at 10-2 mol/L while vigorously stirring the solution.
  • The equivalence point is reached when the red-purple color disappears favor of the blue color of CAL released in the solution.
Illustration of a chronometer ≈ 20 minutes / sample
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