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Answered 2008-10-29 07:58:49

The reaction has to be carried out at neutral conditions because in acid the chromate indicator concentration decreases due to the reaction with the H+ ions, forming HCrO4-. It cannot be in too basic of a solution (greater than 10.5) because then silver hydroxide will form before the silver chromate can form.

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What are the limits for determination of chloride by the Mohr method?

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Can chloride and bromide simultaneously determine by Mohr method?

I want to assmue the the readers of this answer have know the details theory and calculations about Mohr method if not u can refer to Any analytical text for reference. Well, Bromide and Chloride can not be determine simultaneously in a sample using Mohr method , the reason be that the indicator use for each of them is different. and there will be problem in the procedure if ones try to determine both simultaneously. To determine Chloride Ion, Ammonium or Potassium Thiocynate is used as indicator and the sample must be neutral or slightly acidic. while Eosin indicator is use for the determination of Bromide Ion and the same neutral solution is prefer for this purpose, the solution must be adjusted to neutral either by adding small amount of Nitric acid or by adding small amount of carbonate as the case maybe. But, in the determination of each of them Silver Nitrate is use for the titration of both and this is the similarity they shared and the experimental procedure is quite the same. Olajire Mojeed

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