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Female chemist holding litmus paper in hands. Analyzes ph test in a chemical laboratory. Chemistry industry education concept chemistry experiment with ph paper Outdoor pH test pH alkaline and acidic scale pH value scale chart for acid and alkaline solutions, acid-base balance infographic 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 Neutral pH icon Scientist chemist holding ph test in his hands closeup Gloved hands holding ph test strips on light blue background. Alkaline pH environment. Scientist Measuring Ph at Laboratory 実験イメージ　pH