pH-Spectrum of
EDTA-magnesium-complex



recorded by Dr. G. Mermigidis

Experimental:

System Mg - (1.0 mmol/L MgCl2 / dist. water),
System (Mg+E) - (1.0 mmol/L MgCl2 + 1.0 mmol/L EDTA / dist. water),
System (Mg+E)` - (1.0 mmol/L MgCl2 + 1.0 mmol/L CaCl2+ 1.0 mmol/L EDTA / dist. water)


Results:

Fingerprint

System Mg: At pH 12.0 Mg(OH)2 is formed.

Systemprint

System (Mg+E): At pH 5.4 a EDTA-Mg-OH-complex is formed.

Systemprint with Additive, helps you to check the influence of an Additive

System (Mg+E): Due to the greater log KMY of Ca+2, Mg+2 ions will be set free and begin to complex with OH-ions at pH 11.4.

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