A 250.0 g sample of a white solid is known to be a mixture of KNO 3, BaCl2, and NaCl . When 100.

step 1 So here we're identifying some precipitates first. We've got our BASO4 and AGCL. So in the secon

A 250.0 g sample of a white solid is known to be a mixture...

A 250.0 g sample of a white solid is known to be a mixture of KNO $_{3}, \mathrm{BaCl}_{2},$ and $\mathrm{NaCl}$ . When 100.0 $\mathrm{g}$ of this mixture is dissolved in water and allowed to react with excess $\mathrm{H}_{2} \mathrm{SO}_{4}$ 67.3 $\mathrm{g}$ of a white precipitate is collected. When the remaining 150.0 g of the mixture is dissolved in water and allowed to react with excess AgNO $_{3}, 197.6 \mathrm{g}$ of a second precipitate is collected. (a) What are the formulas of the two precipitates? (b) What is the mass of each substance in the original 250 g mixture?

A 250.0 g sample of a white solid is known to be a mixture of KNO $_{3}, \mathrm{BaCl}_{2},$ and $\mathrm{NaCl}$ . When 100.0 $\mathrm{g}$ of this mixture is dissolved in water and allowed to react with excess $\mathrm{H}_{2} \mathrm{SO}_{4}$ 67.3 $\mathrm{g}$ of a white precipitate is collected. When the remaining 150.0 g of the mixture is dissolved in water and allowed to react with excess AgNO $_{3}, 197.6 \mathrm{g}$ of a second precipitate is collected.
(a) What are the formulas of the two precipitates?
(b) What is the mass of each substance in the original 250 g mixture?

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Key Concepts

Mixture Component Analysis

This concept refers to the process of separating and quantifying individual substances within a mixture. It often involves selective chemical reactions that target specific components, thereby allowing for their identification and mass determination.

Precipitation Reactions

These reactions involve the formation of an insoluble solid when two soluble substances are mixed. Understanding precipitation is essential for isolating specific ions from a solution based on their solubility properties.

Gravimetric Analysis

This is a quantitative analytical method where the mass of a precipitate is measured to determine the amount of a specific ion in a sample. It relies on accurate stoichiometric relationships between the ion in the sample and the precipitate formed.

Stoichiometry

Stoichiometry involves using balanced chemical equations to relate the amounts of reactants and products. This concept is critical when calculating the amount of substance or ion present in a reaction based on the mass of a precipitate obtained.

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