Precipitation Reactions in Seawater

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Multiple Choice

Which of the following reactions is a precipitation reaction?

  1. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
  2. NaCl(aq) + H2O(l) → Na+(aq) + Cl-(aq)
  3. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
  4. CH3COOH(aq) + NaOH(aq) → CH3COONa(aq) + H2O(l)
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