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Acids and Bases. 7-5.6. The pH Scale: a tool used to measure how acidic or basic a solution is. Acids pH less than 7 Sour taste Reaction with some metals Examples Lemon Juice Vinegar Black coffee Orange Juice. Bases pH greater than 7 Bitter taste Slippery feel Examples

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## Acids and Bases

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**Acids and Bases**7-5.6**The pH Scale: a tool used to measure how acidic or basic a**solution is**Acids**• pH less than 7 • Sour taste • Reaction with some metals • Examples • Lemon Juice • Vinegar • Black coffee • Orange Juice • Bases • pH greater than 7 • Bitter taste • Slippery feel • Examples • Baking soda • Soapy water • Bleach The pH Scale**Neutral Solution**• pH of 7 • Not an acid or base • Example • Pure Water The pH Scale**Litmus Paper**• Turns red in an acid • Turns blue in a base • Turns Violet in a neutral solution • Phenolphthalein • Tests for a base • Turns magenta in a base • Colorless in an acid or neutral solution • pH Paper • Range of colors depending on pH • Compare color of paper to chart Indicators: substance that can be used to determine if a solution is acidic, basic, or neutral

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