A Study of the Homogeneous Precipitation of Tin (II), Antimony (III) and Arsenic (III) Sulphides in Sulphuric Acid Media

Salah M. Sultan, I. Z. Al-Zamil And Z Al-Drehim

Chemistry Department, College of Science, King Saud University, Riyadh-11451 Saudi Arabia.

ABSTRACT:

The Tin Group cations (tin, antimony and arsenic) have been quantitatively precipitated as sulphides through decomposition of thiocyanatc in sulphuric acid media. The method is more accurate and reliable and found to be more favourable when the results were compared with the thioacetamide method. Quantitative determinations were dependent on acid, thiocyanate and time of heating. Solutions containing H2S04 in the range 1.5-3.0M and thiocyanate in the range 0.1-0.3 M were adequate for precise determination of tin. Sulphuric acid in the range 1.9 to 3.6M and thiocyanate in the range 0.16 to 0.3M were appropriate for precise determination of antimony. While sulphuric acid in the range 1.8-3.8M and thiocyanate in the range 0.1-0.3M were found to be adequate for precise determination of arsenic Heating the reactants for at least 20 minutes on a water bath maintained at 100±5°C was necessary for complete precipitation of the three elements.

KEYWORDS:

Arsenic; Sulphuric

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Copy the following to cite this article: Sultan S. M, Al-Zamil I. Z, Al-Drehim Z. A Study of the Homogeneous Precipitation of Tin (II), Antimony (III) and Arsenic (III) Sulphides in Sulphuric Acid Media. Orient J Chem 1987;3(1).

Copy the following to cite this URL: Sultan S. M, Al-Zamil I. Z, Al-Drehim Z. A Study of the Homogeneous Precipitation of Tin (II), Antimony (III) and Arsenic (III) Sulphides in Sulphuric Acid Media. Orient J Chem 1987;3(1). Available from: http://www.orientjchem.org/?p=42190