In Gravimetric method determines the chloride ion concentration of a solution by gravimetric analysis. A precipitate of silver chloride is formed by adding a solution of silver nitrate to the aqueous solution of chloride ions. The precipitate is collected by careful filtration and weighed.
Ag+(aq) + Cl-(aq) --> AgCl(s)
The precipitate can be collected more easily if the reaction solution is heated before filtering. This causes the solid silver chloride particles to coagulate. The precipitation is carried out under acidic conditions to avoid possible errors due to the presence of carbonate and phosphate ions which, under basic conditions, would also precipitate with the silver ions.
As the method requires very careful weighing of the samples, it is best to use it on solutions that are known to contain a fairly significant concentration of chloride ions, such as seawater. For this reason it should not be used for stream or river water.
Hey! I was wondering if you were able to tell me some similarities as well as discrepancies between gravimetric analysis and indirect Volhard titration. Which one is better?
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