titration

[tolypine]

i have given given a task to determine the concentration of a saturated aqueous solution of chlorine. The question is as follows:


The concentration of a saturated aqueous solution of chlorine (approximately 7g dm3) can be determined by a back titration method.

In the first stage of the procedure, the solution of chlorine is added to an excess suitable reducing agent such as iron(II) compound.

In the second stage the amount of reducing agent left over is determined by titration.

Plan and describe a procedure that could be used safely to determine the exact concentration of saturated aqueous solution of chlorine by back titration. Can anyone please help me with this task. i dont know how to write up the procedure.

[charco]

what you doin' in organic?

you be in the wrong place missie

[john500]

The first step would likely convert Cl2 to chloride ions. The most popular method to determine aqueous chloride content is by titration with an excess of silver nitrate. Silver nitrate (water soluble) nearly quantitatively reacts with chloride ions to form silver chloride (AgCl, water insoluble) in an acidic medium. The silver chloride precipitate is then dried and weighed. Divide the chlorine weight by the silver chloride weight (35/150 ish) to get the g Cl in the sample and finally divide by the sample weight to get a weight % or ppm value. There should be detailed procedures in "Quantitative Analysis" type books.