In complexation volumetry, classify the statements below as true or false. Justify the one(s) that you judge to be “false”. a) When preparing an EDTA solution, to be used as a titrant of Ca2+ ions, it is necessary to add a small amount of Mg2+ in the solution. b) A metallochromic (Ind) indicator is a substance that forms colored complexes with metallic ions. The colors of these complexes are always the same as the colors of the free forms of these indicators. c) In order for the titration of a metal (Me) with EDTA to be carried out, it is necessary that the Me-EDTA complex has a stability constant greater than that of the Me-Ind complex. d) In determining the partial hardness of a hard water sample with EDTA solution, murexide is used as an indicator at pH 10.
In complexation volumetry, classify the statements below as true or false.
Justify the one(s) that you judge to be “false”.
a) When preparing an EDTA solution, to be used as a titrant of Ca2+ ions, it is necessary to add a small amount of Mg2+ in the solution.
b) A metallochromic (Ind) indicator is a substance that forms colored complexes with metallic ions. The colors of these complexes are always the same as the colors of the free forms of these indicators.
c) In order for the titration of a metal (Me) with EDTA to be carried out, it is necessary that the Me-EDTA complex has a stability constant greater than that of the Me-Ind complex.
d) In determining the partial hardness of a hard water sample with EDTA solution, murexide is used as an indicator at pH 10.
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