Investigating the qualities of water that are used in our school environment with respect to the amounts of calcium and magnesium ions and the levels of hardness, by performing complexiometric titrations with EDTA (Ethylene diamine tetraacetic acid)

摘要

As well as it’s known, water is essential for life. A person can live for about one week without eating anything but he/she cannot survive even that long without drinking water. In addition to that, a good qualified drinking water is very rich in minerals, which are also essential for the body and most of the metabolic activities. The quality of water indicates the purity and hardness of water, the amounts of minerals in it and all the other characteristics of water, which form a healthy drinking water. These characteristics are determined by the Health Ministrations or other authorized organizations in every country. Since water is one of the most consumed substances in a day, a person could gain at least some of the needed mineral for the body, from the water. Therefore, especially for a teenage, who are in the age of growing so whose metabolic activities are very fast, the quality of the drinking water becomes very very important.udIn order to measure the quality of water there are various types of experiments. This investigation uses the method of complexiometric titration, which is based on a principle of the high reactivity of the EDTA (Ethylene diamine tetraacetic acid) substance to form EDTA - metal complexes with the metals ions such as calcium and magnesium and giving a color change with metal indicators. By this method the aim is to find the amounts of calcium and magnesium ions in the water supplies that are used in our school environment and their hardnesses.