An unknown solution is determined to contain either potassium hydroxide (KOH) or

Question

An unknown solution is determined to contain either potassium hydroxide (KOH) or potassium sulfate (K2SO4). Using a precipitation reaction, how could you identify the unknown? Specificy which ion you would add to the unkown and how the results would identify which compound is in the unknown. An unknown solution is determined to contain either potassium hydroxide (KOH) or potassium sulfate (K2SO4). Using a precipitation reaction, how could you identify the unknown? Specificy which ion you would add to the unkown and how the results would identify which compound is in the unknown.

Explanation / Answer

Add aqueous Ba^2+ ion (as BaCl2 - this is known as Barium chloride test) solution to both the unknown. Only in case of potassium sulfate (K2SO4) a white percipitate of BaSO4 is formed. In case of potassium hydroxide (KOH) no percipitate is formed as Ba(OH)2 is soluble in water.

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