Title: Acids and Bases
1 Acids and Bases
2Acids
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.
3Some 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
4Some 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
5The 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
6pH of Common Substances
pH paper will indicate the pH of a substance by
the color it changes in a solution
7Learning 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
-
8Solution 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
-
9Learning 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
10Solution 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