Αποτελέσματα Αναζήτησης
There are several tests for sulfate ion to identify from other anions in qualitative analysis. Some of metal sulfate compounds are soluble in water and some metal sulfates form precipitates. Sulfate compounds of several d block metal cations form colours.
Iodine reacts with sulphide in acid solution, oxidising it to sulphur; a titration based on this reaction is an accurate method for determining sulphides at concentration above 1mg/L if interferences are absent and if loss of H 2 S is avoided.
29 Αυγ 2023 · Most sulfates, including those of \(\ce{Na^{+}}\), \(\ce{K^{+}}\), and \(\ce{NH4^{+}}\), are soluble in water. Exceptions that are insoluble are white lead(II) sulfate and white barium sulfate: \[\ce{BaSO4(s) <=> Ba2+(aq) + SO42-(aq)} \nonumber \]
Normally, nehpelometry is the preferred method of measurement when S is less than 0.05, and turbidimetry is preferred at higher values. In this experiment, a natural water or rain sample is assayed turbidimetrically. An excess of barium chloride is added to an acidic solution of the sample.
1 Σεπ 2008 · The determination of sulfate concentration in water by indirect EDTA titration is an instructive experiment that is easily implemented in an analytical chemistry laboratory course. A water sample is treated with excess barium chloride to precipitate sulfate ions as BaSO 4 (s).
Turbidimetric determination of sulphates(VI) in natural water For low contents of SO 4 2-ions in solution, barium sulphate forming after addition of BaCl 2 does not fall down but remains suspended in the solution, causing opacity. Precipitation is carried on in diluted HCl. Opacity develops in time and stabilizes after few minutes.
Abstract. In this study, two simple methods (conductometric titration and turbidimetric method) have been used for the quantitative determination of sulphate ions from aqueous media. Both methods are based on the reaction between sulphate ions and BaCl2, when a white precipitate (BaSO4) is obtained.
