Answers to practice determining whether a precipitate forms:

  1. no precipitate
  2. a) precipitate, b) calcium sulfate, CaSO4, c) Ca2+(aq) + SO42¯(aq) ® CaSO4(s)
  3. a) precipitate, b) iron(III) hydroxide, Fe(OH)3, c) Fe3+(aq) + 3 OH¯(aq) ® Fe(OH)3(s)
  4. a) precipitate, b) copper(II) phosphate, Cu3(PO4)2, c) 3 Cu2+(aq) + 2 PO43¯(aq) ® Cu3(PO4)2(s)
  5. no precipitate
  6. a) precipitate, b) barium sulfate, BaSO4, c) Ba2+(aq) + SO42¯(aq) ® BaSO4(s)
  7. no precipitate
  8. a) precipitate, b) lead(II) carbonate, PbCO3, c) Pb2+(aq) + CO32¯(aq) ® PbCO3(s)
  9. a) precipitate, b) cobalt(II) phosphate, Co3(PO4)2, c) 3 Co2+(aq) + 2 PO43¯(aq) ® Co3(PO4)2(s)
  10. a) precipitate, b) copper(I) chloride, CuCl, c) Cu+(aq) + Cl¯(aq) ® CuCl(s)