Cliffs AP Chemistry, 3rd Edition

Scenario: Part I

A student obtained a 24-well plate and placed samples of solid metals into solutions of various
metallic ions. The results are presented in Table 1 below:

Table 1

Cu(s) Mg(s) Pb(s)

Cu2+(aq) X rxn rxn

Mg2+(aq) no rxn X no rxn

Pb2+(aq) no rxn rxn X

rxn=reaction occurs

Next, drops of bromine water, chlorine water and iodine water were mixed in samples of min-
eral oil and the color of the oil and evidence of a reaction were recorded in the Table 2 below.
Also tested was the halide ion mixed with mineral oil.

Table 2

Bromine water (Br 2 )(aq)+ mineral oil Orange-brown

Chlorine water (Cl 2 )(aq)+ mineral oil Faint greenish-yellow

Iodine water (I 2 )(aq)+ mineral oil Pink

Br–(aq)+ mineral oil Colorless

Cl–(aq)+ mineral oil Colorless

I–(aq)+ mineral oil Colorless

Another plate was set up with bromine water, chlorine water and iodine water mixed with sam-
ples of Br–(aq), Cl–(aq)and I–(aq)to see if the halogens could be reduced by any of the halide ions.
The results of such mixtures are presented in the Table 3 below:

Table 3

Br–(aq) Cl–(aq) I–(aq)

Br2(aq) no rxn mineral oil was mineral oil was pink

orangish-brown

Cl2(aq) mineral oil was no rxn mineral oil was pink

orangish-brown

I2(aq) mineral oil was pink mineral oil was pink no rxn

Part III: AP Chemistry Laboratory Experiments