The purpose of this paper is to suggest an interpretation of the experimental data to make the determination of the surface area of activated charcoal by Langmuir adsorption isotherm more meaningful for the student.

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A reliable method is needed for the determination of micro gram quantities of hydrogen sulfide and sulfur in metal sulfides. A volumetric method based on the oxidation of hydrogen sulfide into sulfate by means of alkali hypochlorite has been investigated. Systematic studies show that this reaction is influenced by the pH and the temperature of the hypochlorite solution. Quantitative oxidation of sulfide into sulfate occurs, at room temperature, in hypo-FOR the determination of small amounts of hydrogen sulfide, or sulfide sulfur that can be converted into hydrogen sulfide by acid evolution, various methods may be used. Probably the most common is based on the oxidation of hydrogen sulfide with iodine to form elementary sulfur, either by titration with a standard iodine solution (3) or by addition of excess iodine and back-titration with thiosulfate. As this reaction utilizes the exchange of 2 electrons only per atom of sulfur, the amount of iodine consumed is relatively small, and very dilute iodine and thiosulfate solutions are needed when microgram quantities of sulfur are to be determined.