| 1 | Rather, the principle is a litmus test. | |
| 2 | Litmus paper can be used as an indicator of the presence of acid in a solution. | |
| 3 | More broadly, ammonium hydroxide (see ammonia) and soluble hydroxides of the alkaline earth metals are also called alkalies. | |
| 4 | Turn the remnant of sodium hydroxide in the tube into water, and you'll find the solution turns red litmus blue. | |
| 5 | Sourness is just another word for acidity, Suslick said, which any high school chemistry student can test for using litmus paper. |
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