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| acid |
a chemical substance that dissolves in water, has a sour taste, and turns blue litmus paper red. [1/4 definitions] |
| litmus paper |
a small strip of treated paper used in chemistry. Litmus paper turns red in an acid and blue in a base. |
| litmus test |
a procedure in which litmus paper is dipped into a solution to determine whether it is an acid or a base. [1/2 definitions] |
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