en litmus paper (n)
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Weight: 1.0
en ph indicator Source: English Wiktionary
en ph indicator (n)
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Weight: 1.0
en acid base indicator Source: English Wiktionary
en phenolphthalein (n)
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Weight: 1.0
en ph indicator Source: English Wiktionary
en cresolphthalein (n)
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Weight: 1.0
en ph indicator Source: English Wiktionary
en chemical indicator
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Weight: 1.0
en ph indicator Source: English Wiktionary