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Gravimetric analysis is a method of chemical analysis that relies on the measurement of mass in order to determine the composition of a sample. This technique is especially useful for determining the mass percent of a given compound in a sample, such as the strontium chloride in a contaminated mixture containing magnesium chloride.
In order to determine the mass percent of strontium chloride in a contaminated mixture, the best substance to react with the contaminated mixture is a substance that will selectively react with strontium chloride but not with magnesium chloride. An ideal reactant for this purpose is barium chloride, as it will form a precipitate with strontium chloride but not with magnesium chloride. The formation of the barium chloride precipitate can be used to determine the mass percent of strontium chloride in the contaminated mixture.
In order to perform the gravimetric analysis, the contaminated mixture must be reacted with barium chloride. The reaction should be carried out in a beaker containing the contaminated mixture and the required amount of barium chloride. The beaker should then be heated to boiling in order to facilitate the reaction. Once the reaction has been completed, the beaker should be allowed to cool and the precipitate should be filtered off, washed, and weighed. The mass of the precipitate can then be used to calculate the mass percent of strontium chloride in the contaminated mixture.
In conclusion, barium chloride is the best substance to react with a contaminated mixture containing both strontium chloride and magnesium chloride in order to determine the mass percent of strontium chloride. By reacting the contaminated mixture with barium chloride and measuring the mass of the resulting precipitate, the mass percent of strontium chloride in the mixture can be accurately determined.
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