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Answers to Precipitate Formation

Answers to practice determining whether a precipitate forms:

1. no precipitate

 

2.

  1. precipitate,
  2. calcium sulfate, CaSO4,
  3. Ca2+(aq) + SO42¯(aq) → CaSO4(s)

 

3.

  1. precipitate,
  2. iron(III) hydroxide, Fe(OH)3,
  3. Fe3+(aq) + 3 OH¯(aq) → Fe(OH)3(s)

 

4.

  1. precipitate,
  2. copper(II) phosphate, Cu3(PO4)2,
  3. 3 Cu2+(aq) + 2 PO43¯(aq) → Cu3(PO4)2(s)

 

5. no precipitate

 

6.

  1. precipitate,
  2. barium sulfate, BaSO4,
  3. Ba2+(aq) + SO42¯(aq) → BaSO4(s)

 

7. no precipitate

 

8.

  1. precipitate,
  2. lead(II) carbonate, PbCO3,
  3. Pb2+(aq) + CO32¯(aq) → PbCO3(s)

 

9.

  1. precipitate,
  2. cobalt(II) phosphate, Co3(PO4)2,
  3. 3 Co2+(aq) + 2 PO43¯(aq) → Co3(PO4)2(s)

 

10.

  1. precipitate,
  2. copper(I) chloride, CuCl,
  3. Cu+(aq) + Cl¯(aq) → CuCl(s)