Water Hardness
concentration of calcium ions in the sample of water. University: University of Tennessee - Knoxville;
Hard water however does not create a threat but is bad for your pipes causing them to crust. These ions react with soap to form an insoluble substance called soap scum.Ca2+ and Mg2+ ions along with other metal ions such as Fe3+ and Pb2+ can be removed from hard water by the addition of EDTA (ethylenediaminetetraacetic acid). Ligands that bind to the metal at more than one coordination site are called polydentate. When this water evaporates or boils the difficult to dissolve metal salts remain as a scaly residue. formed in the reaction are known as complex ions if ionic or complexes (or coordination compounds) if neutral. SMT- 271044
When this form is used as the titrant in a complexometric titration, the titration reaction is: complexes, as in the equation: 3. 6) About 0.2g of Erichrome Black T indicator was added into the beaker. To measure waters softness you are truly measuring the amount of CaCO3 in the water. In this experiment the affinity of EDTA for metal ions will be applied to tap water that has a particularly high mineral content. A 25.00 mL aliquot of the solution required 24.25 mL of an 3.
Determination of total hardness in Water . According to the United States Department of the Interior, <0 to 60 mg/L (milligrams per liter) as calcium carbonate is classified as soft= (Hardness of water, n.). interact with the soap molecules and create a
lab report 6 determination of water hardness