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DENJIRO: Today, I’d like to take a look at the properties of a familiar substance that is sometimes used to treat bug bites: ammonia. Here I have ammonia water. Gaseous ammonia has been dissolved in water. I have here a plastic bottle that contains cotton soaked with hydrochloric acid. I’m going to shoot the air inside the bottle across the ammonia water.
GIRL: It made white rings!
DENJIRO: At first, you can’t see anything, but a white ring is created above the ammonia water. Ammonia reacts with hydrochloric acid and becomes ammonium chloride, turning white. When the gaseous hydrochloric acid shoots out of the plastic bottle and passes above the ammonia water, it reacts with the gaseous ammonia and turns white. As a result, a white ring is created above the ammonia water.
Let’s perform another experiment to see another property of ammonia. I have an upside down flask filled with ammonia. It has a stopper with a glass tube. I will insert the glass tube into water that has blue mallow plant dissolved in it. I will now cool the flask with a cold spray.
GIRL: That’s so interesting!
DENJIRO: The water is shooting out like a fountain, and the color changed from purple to green. Cooling the flask caused the ammonia to contract and the pressure to drop, so the water is sucked up. Then, the ammonia inside the flask dissolves in the water, and the pressure drops further, causing more water to get sucked up. We can see that ammonia easily dissolves in water.
Furthermore, when ammonia melts in water, the water turns alkaline. The water with blue mallow dissolved in it was neutral. The color changed because the water became alkaline.
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