Precipitation Reaction Chemistry Example 3

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Example 3

medium
Will a precipitate form when Na2SO4(aq)\text{Na}_2\text{SO}_4\text{(aq)} is mixed with BaCl2(aq)\text{BaCl}_2\text{(aq)}? Write the equation if a reaction occurs. (Solubility rule: BaSO4\text{BaSO}_4 is insoluble.)

Solution

  1. 1
    Exchange ions: Ba2+\text{Ba}^{2+} + SO42−\text{SO}_4^{2-} → BaSO4\text{BaSO}_4 (insoluble, precipitates). Na+\text{Na}^+ + Cl−\text{Cl}^- → NaCl\text{NaCl} (soluble).
  2. 2
    Balanced equation: Na2SO4(aq)+BaCl2(aq)→BaSO4(s)↓+2NaCl(aq)\text{Na}_2\text{SO}_4\text{(aq)} + \text{BaCl}_2\text{(aq)} \rightarrow \text{BaSO}_4\text{(s)}\downarrow + 2\text{NaCl(aq)}.

Answer

Na2SO4+BaCl2→BaSO4↓+2NaCl\text{Na}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4\downarrow + 2\text{NaCl}
Barium sulfate is highly insoluble and forms a dense white precipitate. This reaction is used in qualitative analysis to test for the presence of sulfate ions.

About Precipitation Reaction

A type of double displacement reaction in which two aqueous ionic solutions are mixed and the exchange of ions produces at least one insoluble ionic.

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More Precipitation Reaction Examples

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Define a precipitation reaction. When solutions of [formula] and [formula] are mixed, a white solid

Example 2 medium

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Example 4 hard

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