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