🍾😖💧

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⚠️💧📉

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🍋🧪4️⃣

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🍋📉

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pH☀️

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🍋⬆️😖

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🧪💧💬

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pH💧

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🔴<7️⃣<🔵💧🧪

#pH scale #acidity #basicity #indicator color #litmus test