Related Experiment Video
Updated: Jun 28, 2026

Calcium Carbonate Formation in the Presence of Biopolymeric Additives
Published on: May 14, 2019
Automatic determination of calcium and magnesium in water
S Impedovo1, A Traini, P Papoff
1Istituto Chimica Analitica Universita' di Bari Italy.
Abstract:
Magnesium and calcium may each be determined in water by an automatic spectrophotometric method. At 571 nm with an excess of Eriochrome Black T as metallochromic agent, the variation m absorbance is proportional to the magnesium concentration regardless of the calcium concentration. By addition of MgEDTA to displace the calcium from its CaEBT complex, this element may be determined at the same wavelength. For 3-25 ppm of magnesium and 5-40 ppm calcium, the standard deviation was about 4%. The apparatus is described.
Related Concept Videos
Qualitative Analysis
For instance, group IV...
Factors Affecting Solubility
Complexometric Titration: Ligands
Chemical Equilibria: Systematic Approach to Equilibrium Calculations
The first step is to identify all the chemical reactions involved, The...
EDTA: Direct, Back-, and Displacement Titration
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...
Common Ion Effect
