Water Hardness is a term employ to describe the concentration of CaCO3 and MgCO3 in a tree trunk of peeing. The sum of the concentrations are called hardness index and is calculated as mg/L or ppm CaCO3. The amount of CaCO3 is determined by titrating the Ca2+ present in the sample. It is generally determined by titration of a water sample with EDTA.
In the first part, preparation of 5 x 10-3 m EDTA titrant was done by dissolving just about 0.47 grams of EDTA in 250 ml distilled water. A pinch of MgCl2 6H2O was added. The solution served as the stock titrant.
In the second part, preparation of diluted EDTA titrant was done. We took 10.00 ml aliquot of the prepared titrant and placed it in a 100.0 ml volumetric flask to dilute. We shook it and this served as the diluted titrant.
In the third part, an assigned group prepared the normal CaCO3 by adding drops of concentrated HCl in the weighed CaCO3 in a 250 ml beaker. It was odd for evaporation and the residue was placed in a 500.0 ml volumetric flask to dilute.
In the fourth part, we determined the drive concentration of EDTA by monetary standardisedization.
Lastly, we determined the hardness of the water. The diluted EDTA titrant was used for the titration of the sample. 10.
00 ml of the sample was used instead of the 10.00 ml standard CaCO3.
Water hardness is an expression for the sum of the calcium and milligram cation concentration in a water sample. These cations shape water-insoluble salts with soap, decreasing soaps cleaning effectiveness. They also form hard water deposits in hot water heaters. The standard way to express water hardness is in ppm CaCO3 that has the convention weight of 100.1 g/mole. An excellent way to determine water hardness is to perform a compleximetric titration using a standard ethylenediaminetetraacetic acid (EDTA) solution. Due to steric hindrances, EDTA will complex with calcium and atomic number 12 in a one-to-one molar ratio. The endpoint in...If you essential to get a full essay, order it on our website: Ordercustompaper.com
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