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17 Cards in this Set
- Front
- Back
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complexation titration |
a titration based upon the formation of a coordination complex |
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complexometric titration |
comexation titration also known as |
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ligand |
an electron donating group species |
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complex |
formed only if the central atom (metal ion) accepts an electron pair from 1 or more ligand |
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polydentate ligand |
a ligand that donates 3 or more airs of electrons |
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EDTA(ethylenediamine-tetraacetate) |
a new method for metal determination evolved employing metal-ion |
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C10H14N2Na2O8•2H2O |
EDTA chemical formula |
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disodium salt |
is preferred over the free acid since it is more water-soluble, nonhygroscopic & very stable |
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complexometric titration |
are used to titrate and analyze the concentrations of metal ions present in the sample solution |
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complex |
when a metal ions combines with a molecule which can donate electrons, the resulting compound is termed _____ |
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chelating agent |
if the ligand can form several bonds to a single metal ions, it can be refered to as the _____ |
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chelate |
if the combining molecule contains 2 or more groups that donate electrons, this complex is called |
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Red to Blue colored solution |
end point of complexometry |
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1. specific sharpness of color change at end point 2. specific for the metal ion under analysis 3. stability constant must be smaller than that of the metal-EDTA complex |
qualities of good indicator |
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Red |
EBT-metal complexes are usually ______ |
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Blue |
with the 1st slight excess of EDTA, the solution turns _______ |
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EDTA |
is used as a chelate (or chelating agent). It has a potential sites for bonding a metal ion |
