Chemistry Goal 10

 Substances can be classified as acid, base, or neutral based on their pH.  Acids and bases are solutions usually with water as a solvent.

 Can be identified by: ◦ Sour taste ◦ Reacts with some metals ◦ Reacts with bases to form a neutral pH solution ◦ pH is less than 7; the lower the number, the more acidic the solution

 Can be identified by: ◦ Bitter taste ◦ Slippery feel ◦ Reacts with acids to form a neutral pH solution ◦ pH is greater than 7; the higher the number, the more basic the solution.

 Is neither an acid nor a base  Pure water is neutral and has a pH near 7

 Substances that can be used to determine whether a solution is acidic, basic, or neutral.

 Changes color in the presence of an acid or a base  Blue litmus paper turns red in an acid and stays blue in a base. ◦ BRA  Red litmus paper turns blue in a base and stays red in an acid. ◦ RBB

 Test for a base ONLY  Is colorless and turns magenta (bright pink) in the presence of a base  Stays colorless in acidic and neutral solutions

 Has a range of colors depending on the pH of the solution  The color of the paper is compared to a chart to determine the actual pH number.

A = ______ B = ______ C = ______ D = ______

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