DATA TABLE (did each mixture produce precipitate YES or NO?)
Each YES or NO represents the result when the sample on the vertical column and
horizontal row were mixed.
Sample #1 #2 #3 #4 #5 #6 #7
#1
#2 YES
#3 YES NO
#4 NO NO YES
#5 NO YES YES NO
#6 NO NO YES NO
#7 YES NO NO NO YES NO
Identify each of the seven samples as Ca$^{2+}$, OH$^-$, Pb$^{2+}$ or Cl$^-$. Explain your
reasoning.
#1 #2 #3 #4 #5 #6 #7
(Hint: Each of the four types of unknowns will precipitate a different # of times in
this experiment.)
