Question

If you combine solutions of metal cations with various anion solutions. Based on what you know about soubility rules for which of the following combinations do you expect to observe the formation of a precipitate? Select all that apply.

a. Pb2+ and CO32-
b. Pb2+ and I-
c. Fe3+ and Cl-
d. Cu2+ and SO42-
e. Al3+ and Cl-

Answer 1

Answer:

Precipitates are in option a and b

Explanation:

These are the chemical reactions:

a. Pb²⁺  + CO₃⁻²  →  PbCO₃ ↓

b. Pb²⁺  + 2I⁻  →  PbI₂  ↓

c. Fe³⁺ + 3Cl⁻ → FeCl₃

d. Cu²⁺ + SO₄⁻²  → CuSO₄

e. Al³⁺ + 3Cl⁻ → AlCl₃

Iodides, chlorides and bromides are soluble except the ones with Ag, Pb and Hg

All the carbonates are insolubles except the alkali carbonates.

All the sulfates are solubles except the one that are formed with Group II (Ba, Ca and Mg)