alleryStart learning →Which solution would precipitate barium ions from a water sample, and what solid forms?
ASodium chloride, forming solid BaCl2
BSodium hydroxide, forming Ba(OH)2
CSodium nitrate, forming Ba(NO3)2
DSodium sulfate, forming solid BaSO4
Answer & Solution
Correct answer: D. Sodium sulfate, forming solid BaSO4
1. Test each anion against the solubility guidelines while pairing it with Ba2+.
2. Chloride salts are soluble and barium is not an exception, so BaCl2 stays dissolved.
3. Hydroxides are usually insoluble, but Ba2+ is one of the two stated exceptions, so Ba(OH)2 dissolves.
4. Nitrates carry no exceptions at all, so Ba(NO3)2 stays dissolved.
5. Sulfates are usually soluble, but barium is on the exception list, so BaSO4 precipitates.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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