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ACIDS AND BASES

ACIDS AND BASES. pH less than 7 Neutralizes bases Forms H + ions in solution Corrosive-reacts with most metals to form hydrogen gas Good conductors of electricity. What is an ACID?. Tastes sour . It turns blue litmus paper red React strongly with metals. Characteristics Of Acids.

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ACIDS AND BASES

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  1. ACIDS AND BASES

  2. pH less than 7 Neutralizes bases Forms H + ions in solution Corrosive-reacts with most metals to form hydrogen gas Good conductors of electricity What is an ACID?

  3. Tastes sour. It turns blue litmus paper red React strongly with metals Characteristics Of Acids

  4. Common Acids • HCl- hydrochloric- stomach acid • H2SO4- sulfuric acid - car batteries • HNO3 – nitric acid - explosives • HC2H3O2- acetic acid - vinegar • H2CO3-carbonic acid – sodas • H3PO4- phosphoric acid -flavorings

  5. pH greater than 7 Feels slippery Dissolves fats and oils Usually forms OH- ions in solution Neutralizes acids What is a BASE?

  6. Tastes bitter. It feels slippery. (Soapy Water) It turns Red Litmus Blue. Characteristics of Bases

  7. NaOH- sodium hydroxide (LYE) soaps, drain cleaner Mg (OH)2 - magnesium hydroxide-antacids Al(OH)3-aluminum hydroxide-antacids, deodorants NH4OH-ammonium hydroxide- “ammonia” Common Bases

  8. pH Scale ( 0 – 14 )

  9. pH of Common Substances Timberlake, Chemistry 7th Edition, page 335

  10. pH paper pH paper changes color to indicate a specific pH value.

  11. “Heartburn” Planting vegetables and flowers Fish Tanks and Ponds Blood Swimming pools Situations in which PH is controlled

  12. Digestion- process by which foods are broken down into simpler substances. Mechanical digestion- physical process in which food is torn apart (mouth) Chemical digestion- chemical reactions in which large molecules are broken down into smaller molecules. (stomach and small intestines) Digestion and pH

  13. Mouth -pH around 7. Saliva contains amylase, an enzyme which begins to break carbohydrates into sugars. Stomach - pH around 2. Proteins are broken down into amino acids by the enzyme pepsin. Small intestine -pH around 8. Most digestion ends. Small molecules move to bloodstream toward cells that use them pH in the Digestive System

  14. http://sv.berkeley.edu/showcase/flash/juicebar.html

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