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Acids and Bases

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... slippery React with acids to form salts and water pH greater than 7 Turns ... Acids Some Properties of Acids Some Properties of Bases The pH scale is a way ... – PowerPoint PPT presentation

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Title: Acids and Bases


1
Acids and Bases
2
Acids
Have a sour taste. Vinegar is a solution of
acetic acid. Citrus fruits contain citric acid.
React with certain metals to produce hydrogen gas.
React with carbonates and bicarbonates to produce
carbon dioxide gas
Bases
Have a bitter taste.
Feel slippery. Many soaps contain bases.
3
Some Properties of Acids
  • Produce H (as H3O) ions in water (the
    hydronium ion is a hydrogen ion attached to a
    water molecule)
  • React with bases to form a salt and water
  • Corrode metals
  • Electrolytes
  • Taste sour
  • pH is less than 7
  • Turns blue litmus paper to red
  • Blue to Red A-CID

4
Some Properties of Bases
  • Produce OH- (hydroxyl) ions in water
  • Taste bitter, chalky
  • Are electrolytes
  • Feel soapy, slippery
  • React with acids to form salts and water
  • pH greater than 7
  • Turns red litmus paper to blue
  • Basic Blue

5
The pH scale is a way of expressing the strength
of acids and bases. pH can be viewed as an
abbreviation for power of Hydrogen - or more
completely, power of the concentration of the
Hydrogen ion. 0 - 7 acid 7 neutral
7 14 base
6
pH of Common Substances
pH paper will indicate the pH of a substance by
the color it changes in a solution
7
Learning Check AB1
  • Describe the solution in each of the following
    as 1) acid 2) base or 3)neutral.
  • A. ___soda
  • B. ___soap
  • C. ___coffee
  • D. ___ wine
  • E. ___ water
  • F. ___ grapefruit

8
Solution AB1
  • Describe each solution as
  • 1) acid 2) base or 3) neutral.
  • A. _1_ soda
  • B. _2_ soap
  • C. _1_ coffee
  • D. _1_ wine
  • E. _3_ water
  • F. _1_ grapefruit

9
Learning Check AB2
  • Identify each as characteristic of an A) acid
    or B) base
  • ____ 1. Sour taste
  • ____ 2. Produces OH- in aqueous solutions
  • ____ 3. Chalky taste
  • ____ 4. Is an electrolyte
  • ____ 5. Produces H in aqueous solutions

10
Solution AB2
  • 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, B 4. Is an electrolyte
  • _A_ 5. Produces H in aqueous solutions
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