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Neutral pH icon Scientist Measuring Ph at Laboratory Outdoor pH test Female chemist holding litmus paper in hands. Analyzes ph test in a chemical laboratory. Chemistry industry education concept pH value scale chart for acid and alkaline solutions, acid-base balance infographic Web pH value scale chart for acid-alkaline solution. Acid-base balance infographic isolated on white background. Indicator for concentration of hydrogen ion in solution. Vector illustration ph scale vector graphic . acid to base chemistry experiment with ph paper A pH scale on white background pH scale indicator chart diagram acidic alkaline measure. pH analysis vector chemical scale value test 実験イメージ　pH