Double Replacement Micro-Reactions - Experiment 11

This experiment demonstrates reactions that occur between two aqueous solutions. The driving force for the reaction is the formation of an insoluble product.

Materials Substitutions
0.1 M NaCl
0.1 M CuSO4
0.1 M AgNO3
0.1 M Na3PO4
0.1 M NaOH
spot plate 6 watch-glasses
5 droppers

Procedure

  1. Using a spot plate, place 10 drops of NaCl solution into wells I and IV, 10 drops of NaOH into wells II and V, and 10 drops of Na3PO4 into wells III and VI.
  2. Add 10 drops of CuSO4 to wells I, II, and III and 10 drops of AgNO3 to wells IV, V, and VI.
  3. Note any color changes or precipitate formation.
  4. Write a balanced equation for the reactions that occur. Include physical state symbols for the reactants and products. If no precipitate occurred, NO REACTION occurred.

Data and Observations

I.
II.
III.
IV.
V.
VI.

Teacher’s Notes
I. NaCl (aq) + CuSO4 (aq) –> No Reaction.

II. 2 NaOH (aq) + CuSO4 (aq) –> Na2SO4 (aq) + Cu(OH)2 (s)

III. Na3PO4 (aq) + CuSO4 (aq) –> No Reaction

IV. NaCl (aq) + AgNO3 (aq) –> NaNO3 (aq) + AgCl (s)

V. NaOH (aq) + AgNO3 (aq) –> NaNO3 (aq) + AgOH (s)

VI. Na3PO4 (aq) + AgNO3 (aq) –> 2 NaNO3 (aq) + Ag3PO4 (s)

Disposal
Aqueous solutions may be flushed down the sink. Solids should be collected and placed into a labeled, solid waste container.