scale indicator chart diagram acidic alkaline measure analysis vector chemical value test |
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| navigate by keyword : strip value colours scientific measure measurement scale lab test fluid solution concentration diagram experiment infographic laboratory chart chemistry analysis balance chemical science liquid medicine education acid basic soil substance universal indicator base neutral text isolated paper white alkaline acidic blue design vector color water icon background acidity litmus |
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| pH scale indicator chart diagram acidic alkaline measure. pH analysis vector chemical scale value test. |
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