Consider the reaction: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) Which feature of this reaction justifies classifying it specifically as a precipitation reaction?
Insoluble barium sulphate forms in solution
A precipitation reaction is defined by the formation of an insoluble solid (a precipitate) when two soluble ionic solutions are mixed. In the given reaction, Na2SO4 and BaCl2 are both aqueous, but when they combine, Ba2+ and SO42− ions come together to form barium sulphate, which is insoluble in water and separates out as a solid (s).
Being in aqueous form or exchanging partners is common to many double displacement reactions and is not enough by itself to make a reaction a precipitation reaction; sodium chloride staying dissolved is a consequence, not the defining feature. It is the appearance of the insoluble BaSO4 that specifically classifies this as precipitation.
Hence, the answer is Insoluble barium sulphate forms in solution.
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