Name ___________________________________________________
Ionic Formulas Lab II
1. Write a complete, balanced equation for the reaction between aqueous solutions of copper (II) chloride and sodium phosphate.
2. Write an overall ionic equation for the reaction.
3. Write a net ionic equation for the reaction.
Test Tube
# of drops of
0.1 M CuCl2
# of drops of
0.1 M
Na3PO4
Ratio of Cu2+
to PO43Draw each
tube,
showing the
relative
amount of
precipitate in
each tube
and label the
color of the
solution
above the
precipitate.
Limiting
reagent
excess
reagent
Drops of
excess
#1
3
#2
6
#3
12
#4
15
#5
18
#6
24
#7
27
27
24
18
15
12
6
3
1:9
CuCl2
Na3PO4
25
4. Which test tube had the most precipitate?
5. According to the formula for the precipitate, which tube should theoretically have the most precipitate?
6. If there is a difference between the actual and the theoretical, give a logical explanation for the difference.
7. Which tubes should have Cu2+ ions still in solution above the precipitate?
8. How could you provide evidence that there are Cu2+ ions still in solution in test tube #7, but not in test tube #1?
9. How many drops of CuCl2 are needed to precipitate all the excess PO43- ions out of solution in test tube # 2?
10. How many drops of Na3PO4 would be needed to precipitate all the excess Cu2+ ions out of solution in test tube #6?