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So, what happens when we put zinc metal in with hydrochloric acid, concentrated hydrochloric acid? Here, I have zinc metal, obtained from pennies here in the U.S., and we put concentrated hydrochloric acid on it. Right away, we get those bubbles thatamp;#39;s hydrogen gas. The equation is zinc plus hydrochloric acid gives us zinc chloride, which is aqueous, so that stays dissolved in the water, and H2, diatomic hydrogen gas, and those are the bubbles. You can really see them rising here in the flask with hydrochloric acid. We can actually capture that hydrogen gas; itamp;#39;s called collecting a gas over water. We fill a test tube with water and put it in this beaker. In the tube, all of the hydrogen gas goes through, and you can see the bubbles going up into the test tube, displacing the water. So, thatamp;#39;s going to be pure H2 gas. We take a flame and ignite the hydrogen gas, and you can see that we have that reaction there. Oftentimes, when you
