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Acids and Bases

Acids and Bases. Definitions Indicators and Measurements. Definitions. pH: measure of the acidity or alkalinity of a substance, non-characteristic property Acid: a substance with a pH value less than 7, ex- lemon juice Base: a substance with a pH value over 7, ex- bleach

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Acids and Bases

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  1. Acids and Bases Definitions Indicators and Measurements

  2. Definitions • pH: measure of the acidity or alkalinity of a substance, non-characteristic property • Acid: a substance with a pH value less than 7, ex- lemon juice • Base: a substance with a pH value over 7, ex- bleach • Neutral: a substance with a pH of 7, only distilled(pure) water • Indicator: a substance that changes color in the presence of an acid or a base, ex- Litmus paper and Universal pH paper

  3. Litmus Paper • BLUE Litmus paper  red = acid • RED Litmus paper  blue = base • BLUE and RED Litmus paper  remain the same colour = neutral

  4. Universal pH Paper • More accurate than Litmus paper • Indicates the substance’s level of pH, between 1(more acid) and 14 (more basic)

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