| A | B |
|---|
| metallic sulfides - | usually black or brown |
| chromates - | usually yellow |
| BaCO3 (s) | white |
| PbCl2 (s) | white |
| PbI2 (s) | yellow |
| AgCl (s) | white |
| AgI (s) | yellow |
| Ag2CrO4 (s) | red |
| TiO2 (s) | white |
| sulfur | yellow (most common) |
| Cu(OH)2 (s) | light blue |
| CuO (s) | black |
| CaCO3 (s) | white |
| most gases | are colorless |
| NO2 )g) | brown |
| CL2 )g) | yellow green |
| Na+ | yellow |
| K+ | purple(pink) |
| Ba2+ | green |
| Li+, Ca2+, Sr2+ | red |
| Cu2+ | blue-green |
| Iodine WHEN DISSOLVED IN NONPOLAR SOLVENT | hot pink/purple |
| Bromine WHEN DISSOLVED IN NONPOLAR SOLVENT | orange |
| Chlorine WHEN DISSOLVED IN NONPOLAR SOLVENT | pale yellow |
| Starch + iodide ˆ | colorless |
| Starch + iodine ˆ | blue-black |
| Phenolphthalein in base = | pink |
| Phenolphthalein in acid = | colorless |
| Bromothymol blue in base = | blue |
| Bromothymol blue in acid = | yellow |
| Ions w/ unpaired d sublevel electrons | are often colored |
| Ions w/ all paired electrons | are colorless (Ex. ZN2+, Mg2+, Al3+) |
| Cu2+ | blue |
| Cr2O72- | orange |
| MnO41- | purple |
| Ni2+ | green |
| Fe2+ | yellow or green |
| Fe3+ | red or orange |
| FeSCN2+ | blood red |
| CrO42- | yellow |
| Cu(NH3)42+ | bright blue |
| Co(H2O)62+ | pink |
| CoCl42- | blue |
