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acids and bases n.
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Acids and Bases

Acids and Bases

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Acids and Bases

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  1. Acids and Bases

  2. What do you think?

  3. What are they? • A way to classify a substance based on the pH scale • pH is a measurement of the amount of hydrogen ions (hydrogen ion is +, did this gain or lose an electron?) • Scale of 0 to 14 • Substances less than 7 are considered an acid • Substances more that 7 are considered to be a base • Pure water is given a pH of 7

  4. pH Scale

  5. Acids • Produce H+ (as H3O+) ions in water • Produce a negative ion (-) too • Taste sour • Corrode metals • React with bases to form salts and water

  6. Bases • Produce OH- ions in water • Taste bitter, chalky • Are electrolytes • Feel soapy, slippery • React with acids to form salts and water

  7. Learning Check Describe the solution in each of the following as: 1) acid 2) base or 3)neutral. A. ___soda B. ___soap C. ___coffee D. ___ blood E. ___ water F. ___ grapefruit

  8. Answers Describe each solution as: 1) acid 2) base or 3) neutral. A. _1_ soda B. _2_ soap C. _1_ coffee D. _1_blood E. _3_ water F. _1_ grapefruit

  9. Learning Check 2! Identify each as characteristic of an A) acid or B) base ____ 1. Sour taste ____ 2. Produces OH- in aqueous solutions ____ 3. Chalky taste ____ 4. Produces H+ in aqueous solutions

  10. Solutions Identify each as a characteristic of an A) acid or B) base _A_ 1. Sour taste _B_ 2. Produces OH- in aqueous solutions _B_ 3. Chalky taste _A_4. Produces H+ in aqueous solutions

  11. Exit Slip • What do you think this has to do with what we’re learning?