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| Solutions: universal indicator, NaCl, and vinegar. | This is litmus paper. When you dip it in a solution, red means the solution is an acid. Blue means the solution is a base. |
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| Neil is dropping of universal indicator in tray. | Red solutions are acids and blue solutions are basics. |
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| Another group is experimenting with the universal indicator. | Kelly & Lauren are discussing the universal indicator. |
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Click the peanut or these words to go back to page 1. |
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