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Esplorante la pH-kvanton (acida, neŭtrala, baza) de likvaĵo sorbigu la lakmusan paperon ne komplete, sed enmetu nur la finaĵon de la papero.
When investigating the pH (acidic, neutral, alkaline) of a liquid, don't soak the litmus paper completely in the liquid but just put the end of the paper in it.