1. Give one possible error you could have made in carrying out the experiment (not a
calculation error) that would cause your
a) percent NaCl to be too small
b) percent SiO2 to be too large
2. Solubilities of Compounds A, B and C were determined and summarized in the following
table:
cold water hot water
A.) insoluble soluble
B.) insoluble. insoluble
C.) soluble. Soluble

a) Describe the process you would use to separate compounds A and B if both
compounds were present in a mixture.
b) If compounds A and C were present in a mixture, could they be separated using
hot water? Why or why not?
c) Circle correct letter of compound for each consecutive step and give reasons for
your answers. You have a mixture of the 3 compounds above, A, B and C.
1) You add hot water to the mixture and filter: A, B, C remains on the filter paper.
2) You chill the solution that passed through the filter paper and filter again:
A, B, C remains on the filter paper.
3) You evaporate the water from the solution in the beaker and A, B, C remains
in the beaker.