Place about 1mL of the V²⁺ solution into a large test tube, and add about 5 mL of 2M NaOH at once. This converts V²⁺ into its basic form, V(OH)₂ (s). Record your observations, and write a net ionic equation for the reaction that has occurred.

Repeat this procedure for each of the other oxidation states of vanadium (V³⁺, VO²⁺, and VO₂⁺). Record your observations and write net ionic equations for each reaction.

You can determine the oxidation state of vanadium present by its color if you convert the vanadium species back its acidic form. In each case, add 3 mL of 3M H₂SO₄ to the test tube and mix well. Note the color of each solution. Have the vanadium species undergone oxidation due to exposure to the air? If so, the vanadium species has been oxidized by O₂; write the net ionic equation for any reaction which has occurred.