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Acids, Bases, and pH

Acids, Bases, and pH. A water molecule can react to form ions. Water   Hydrogen ion + Hydroxide ion. The pH scale. Indicates the concentration of hydrogen ions in solution. Ranges from 0-14 7 = neutral or H = OH Pure water has a pH of 7.

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Acids, Bases, and pH

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  1. Acids, Bases, and pH • A water molecule can react to form ions. • Water   Hydrogen ion + Hydroxide ion

  2. The pH scale • Indicates the concentration of hydrogen ions in solution. • Ranges from 0-14 • 7 = neutral or H = OH • Pure water has a pH of 7. • Each step on scale represents a factor of 10. Solution with pH of 4 has 10 times as many H ions as a solution with pH of 5.

  3. The pH scale Acids Bases Any compound that forms H+ ions in solution. pH will be lower than 7 Hydrochloric acid produced by the stomach to digest food is a strong acid with pH around 1.5 Any compound that forms OH- ions in solution. pH will be higher than 7 Bleach has a pH of 12.5

  4. Buffers • Are weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH. • Our body needs buffers to control pH in order to maintain homeostasis. Our body cells generally like to be kept in a pH between 6.5 and 7.5.

  5. Check • Rainwater (pH 5.5), Tomato Juice (pH 4.0), Gastric juice (pH 2.0). Which has the highest concentration of OH- ? • When pH in the stomach increases from 3 to 5, how does the hydrogen ion concentration change?

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