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pH value scale chart for acid and alkaline solutions, acid-base balance infographic A pH scale on white background Hand performing a PH test with electronic measuring device Outdoor pH test 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 実験イメージ　pH Neutral pH icon Female chemist holding litmus paper in hands. Analyzes ph test in a chemical laboratory. Chemistry industry education concept Web Ph scale infographic. Vector flat healthcare illustration. Color meter with number, text and sample item color icon from acidic to alkaline. Design for pharmacy, health care, cosmetology pH scale indicator chart diagram acidic alkaline measure. pH analysis vector chemical scale value test ph scale vector graphic . acid to base