Didactica de la quimica

摘要

This article provides live volumetric procedures to analyse the alkalinity,the hardness,the chloride,the dissolved oxygene and the organic matter contents in tap water samples.These five titrations can be realized in non-compulsory levels of the secondary education since they are simple to carry out due to their easiness and they cover acid-base,complexation,precipitation and redox titrations as well as direct,indirect and back titrations.