Question

Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION.

a) copper (II) bromide and lead (II) acetate

b)lithium sulfide and strontium iodide

c)chromium (III) nitrate and sodium phosphate

Answer 1

a)

CuBr2(aq) + Pb(CH3COO)2 --> PbBr2(s) + Cu(CH3COO)2(aq)

precipitate is PbBr2 (s)

b)

Li2S(aq) + SrI2(aq) --> SrS(s) + 2LiI(aq)

SrS preicpitates

c)

Cr(NO3)2 + Na3PO4(aq) --> Cr3(PO3)2(s) + 3NaNO3(aq)

Cr3(PO3)2(s) forms precipitate