what is a chelating effect?what r factors affectin stability of chelates as compared to monodentate ligands?

Answer 1

Your spelling can use some work. A chelate is a molecule with multiple places where a reaction can take place. The old favorite is EDTA or ethylene-diamine-tetra-acetic acid with structure
(HOOCCH2)2-N-CH2-CH2-N-(CH2COOH)2.
When the (OH) hydrogens are removed (such as with basic conditions), the mono-, di-, tri- or tetra-acetate can cooordinate covalently bond to a transition metal ion at multiple spd(x) orbitals. Moreover, the nitrogens of the amines each have a set of electrons which can also bond. Thus, the molecule literally "wraps" itself around the transition metal ion. "Chelate" itself comes from the word for crab.

This discussion suggests 3 factors AFFECTING stability: the shape of the chelate molecule, the number of reactions the chelate molecule can participate in and the pH at which the reaction will occur.

Answer 2

Chelating Effect

Answer 3

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