We're going to do a flame test on a number of selected compounds, primarily group 1 and 2 ions. These are aqueous solutions and we have just an inert metal loop. We're going to dip the end into the solution and put it into the flame. And that excitation characteristic color is like a fingerprint for an element. So we're going to look at a number and then we're going to ask you to identify some unknowns, potassium. It should be a lavender color. This is barium. It's a green. This is calcium. Calcium. It's sort of a yellow red. It's a strong term. This one's a pretty red one. Sodium is a bright yellow. And the last one is copper. This is the most vivid of all of them. Nice green.