Answers to Precipitate Formation

Chemical Principles (Zumdahl and Decoste)
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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)