1. Chemistry
Acids & Bases

2. Properties of acids and bases
Electrolytes
Taste sour
Turn litmus paper red
0-6.9 on pH scale
React with metals to form Hydrogen gas (H2)
Form H+ ions when in water
Examples: vinegar, milk, soda, apples, citrus fruits
Electrolytes
Taste bitter
Turn litmus paper blue
on pH scale
Feels slippery
Form OH- ions when in water
Examples: ammonia, lye, antacid, baking soda

3. pH scale Label the pH scale from 0-14
Label the scale where the following terms would be found
Strong acid
Weak acid
Strong base
Weak base
Neutral

4. Acid or Base?
Classify the following pH values:
pH = 1
pH = 13
pH = 8
pH = 3
pH = 6
pH = 10

5. Acid or Base?
Classify the following pH values:
pH = 1
pH = 13
pH = 8
pH = 3
pH = 6
pH = 10
Acid
Base

6. pH of common substances

7. B. pH Scale- ions in solution
EX:
pH = -log[H3O+]
pOH = -log[OH-]
pH + pOH = 14
[H+] = 1 x 10-9
[H+] = 1 x 10-3
[H+] =1 x 10-7
[OH-] = 1 x 10-9
[OH-] = 1 x 10-3
Acids/bases dissociate into their prospective ions when in solution. This makes them conduct a current TOO! Since there are + and – ions in solution, they are electrolytes!!

8. Draw HCl (hydrochloric acid) dissociating into it’s ions:
Draw NaOH (sodium hydroxide) dissociating into it’s ions:

9. Properties of acids and bases:
Get 8 test tubes. Rinse all tubes well with water.
Add 2 droppers full acid to four tubes,
2 droppers full of base to the other four.
Touch a drop of base to your finger. Record the feel in the chart (on the next slide).
Wash your hands with water.
Repeat for acid.
Use a stirring rod, drip a drop of base to the litmus and pH papers
(for pH paper use a color key to find a number).
Record results. Repeat for acid.
into the four base tubes add:
a) one drops of phenolphthalein,
b) one drop of bromothymol blue
c) a piece of Mg,
d) a small scoop of baking soda.
Record results.
Cleanup (wash tubes, pH/litmus paper in trash). Wipe down tables. Wash hands

10. Activity:
base
acid

11. Lab roles-write who Label test tubes Label pipettes Get materials
EVERYONE rinses glassware