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Complexometric Essay Topics & Paper Examples

Complexometric Determination of Water Hardness

When a polyatomic ligand with multiple lone pairs of electrons available for bonding to a central metal ion forms a complex with a metal ion, a process known as chelation takes place. Metal ion impurities can be found by using disodium salt of EDTA to determine the concentration of M2+ by complexometric or chelometric titration. Erichrome Black T makes it easy to see when the EDTA has completely chelated the metal impurities. When the metal cation is still present in the water, the solution will be a complex with a pink tint. Once enough EDTA has been added to the M2+ solution the metal ions complex to the EDTA leaving the indicator solvated causing a color change from pink to…

Complexometric Determination of Water Hardness

Abstract The water hardness for unknown water sample number 40 was determined. From the results of the two complexometric titrations, the water hardness of the unknown sample was calculated to be 250.9 ppm CaCO3, which agrees with the ranges of acceptable water hardness in the city of Phoenix and Tempe Arizona. Introduction When rainfall picks up impurities from the soil, ions of sodium, magnesium, calcium, iron, and other metals are dissolved into the water. These impurities are what cause residues left on glassware from the reaction with the soap used for cleaning. Water hardness is from the metal ions with a +2 charge or higher being dissolved into the rainfall. When reporting water hardness, it is reported in units of…