Which elements do not form a complex with EDTA?
Be is the only group 2 element that does not form a stable complex with [EDTA]4−⋅Mg2+ and Ca2+ have the greatest tendency to form complexes with [EDTA]4−.
Why do you use the DI sodium salt of EDTA but not its tetra sodium salt?
The disodium salt of EDTA is preferred in hardness estimation mainly because it is more soluble in aqueous solutions which allows release of the EDTA ligand into solution to react.
Is EDTA forms complexes with all metal ions?
The EDTA molecule has six coordinative sites. It is a hexadentate ligands i.e. it has two binding nitrogen atoms and four oxygen atoms from carboxyl groups and it forms complexes with almost all metal ions. EDTA as a tetraprotonic acid, H4Y disociates through four steps, yielding the ions HsY-, H2Y2-, HY3- and Y4-.
Why is di sodium salt of EDTA used rather than EDTA?
Principle: Hardness in water is due to the presence of dissolved salts of calcium and magnesium. Since EDTA is insoluble in water, the disodium salt of EDTA is taken for this experiment.
Does EDTA complex with sodium?
Ethylenediaminetetraacetic acid (EDTA) is a widely used metal-ion complexing agent. While the EDTA complexes with sodium and potassium ions are weak compared to those formed with many other metal ions, the complexation of EDTA by these two metal ions may be important in certain situations.
Does EDTA bind to sodium?
Sodium calcium edetate, an EDTA derivative, is used to bind metal ions in the practice of chelation therapy, such as for treating mercury and lead poisoning.
Does EDTA complex sodium?
High ionic radius and hardness of alkali and alkaline earth metal ions against the soft carboxylate make chelation less favourable with respect to softer metal ions, such as group III metals and transition metals. Hence EDTA doesn’t form a complex with sodium but forms a salt.