Reaction of aqueous solutions of barium chloride and sodium sulfate re

QUESTION

Reaction of aqueous solutions of barium chloride and sodium sulfate results in the formation of a percipitate of barium sulfate. Sodium chloride is also formed but is soluble in water. Why would you use filtration to isolate the barium sulfate rather than evaporation or recrystallization?BaCl2(aq) +¦
If we use evaporation or recrystallization, we would only remove the water, leaving behind the barium sulfate and the sodium chloride. We want to separate them , not get a mixture of barium sulfate and sodium chloride. Also, any unreacted barium nitrate and sodium sulfate will become solids and contaminate the barium sulphate solid that we will obtain. We use filtration, because this method allows the soluble salts to pass through the filter, leaving behind the insoluble part, the barium sulfate. Even unreacted barium nitrate and sodium sulfate is allowed¦

to pass through the filter. BaSO4 is a solid precipitate and NaCl in dissolved in the water. If you evaporated the water, you would be left with a mixture of NaCl and BaSO4. To recrystallize BaSO4, you would first have to isolate it (by filtration), then dissolve it and allow it to recrystallize. Why not just filter was wash out any adhering NaCl (or unreacted reactant).

ANSWER:

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