Question

Name three reagents, using general solubility rules, that would form precipitates with each of the following ions in aqueous solution. Write the net ionic equeation for each.

a)calcium ion

b) sulfate ion

c) silver ion

d)iron (III) ion

Answer 1

a)

Ca+2(aq) + PO4-3(aq) --> Ca3(PO4)2(s)

Ca+2(aq) + CO3-2(aq) --> CaCO3(s)

Ca+2(aq) + S-2(aq) --> CaS(s)

b)

SO4-2 ion:

Ba+2(aq) + SO4-2(aq) --> BaSO4(s)

2Ag+(aq) + SO4-2(aq) --> Ag2SO4(s)

Ca+2(aq) + SO4-2(aq) --> CaSO4(s)

c)

Ag+ ion:

2Ag+(aq) + SO4-2(aq) --> Ag2SO4(s)

Ag+(aq) + Cl-(aq) --> AgCl(s)

2Ag+(aq) + CO3-2(aq) --> Ag2CO3(s)

d)

Fe+3 ion:

Fe+3(aq) + S-2(aq) --> Fe2S3(s)

Fe+3(aq) + CO3-2(aq) --> Fe2(CO3)3(s)

Fe+3(aq) + PO4-3(aq) --> FePO4(s)