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| Look, it says here that pH paper and phenolphthalein are other indicators if a substance is an acid or a base. | |
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| In the pH meter, if the pH of the substance is less than 7, it's an acid. If it's more than, it's basic. | |
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| While in the pOH meter, if the substance is less than 7, it's basic. If it's more than , it's acidic. | |
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| Hmm. Lewis. The name sounds familiar. | |
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