Cautiously add 10 mL of 6 M H2SO4 a few drops at a time to the deep blue solution
from Part E. (NOTE: A great deal of heat is generated in this reaction and
the solution may become very hot. Handle the solution very carefully!) After
all the H2SO4 has been added, the solution will be sky blue in color as it was in
Parts B and D, because the ion is in solution.