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Carbonic acid is evolved, and, passing into the adjoining flask, is absorbed by the baryta, precipitating it as carbonate. To prevent the precipitate forming around or choking up the entrance tube, the flask must be agitated at short intervals to break it off. The reaction so familiar to us in other determinations is expressed thus: MnO +KO,C O +2SO = MnO,SO +KO.SO +2CO ,
It is therefore destroyed by the addition of acid, and the solution is then made neutral with the solution of bicarbonate, part of which reacts with the acid, the excess remaining in solution. The reaction during titration is the following: Na AsO + I + 2NaHCO > Na AsO + 2NaI + 2CO + H O
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