Control Parameters of Mohr’s Titration

Abstract

The aim of this research is to test the validity and reproducibility of Mohr's titration, against different parameters, test solutions (NaCl) were prepared at different concentrations, standard silver nitrate solutions were also prepared at different concentrations, titrations were carried using potassium chromate (5%) as indicator, and the results were recorded. Most of the results showed high validity and reproducibility. Different amounts of indicator were also prepared to examine which is the suitable amount of indicator can be used in Mohr's titration, results confirmed that 5% indicator the more suitable as sited in the literature. Mohr's titration was carried out at different pH's to examine the best pH for this titration, the pH (6.807) was found to be the most suitable pH for Mohr's titration. Mohr's titration has been done in different temperature to examine validity of this titration in different temperatures. Parallel to Mohr's titrimetric method, conductimetric and ion-selective electrode measurements were carried out, the obtained data showed similar results between titrimetric and conductimetric method, due to sensitivity of ion-selective electrode technique its results were rather low compared to both other techniques.