2. pH pH scale- measure of H+ ions (acidity); “power of hydrogen” #10.
H + = hydronium ion
OH- = hydroxide ion

3. pH
acid- lots of H+ ions
taste sour
feel watery
#11.

4. pH
base- lots of OH- ions
taste bitter
feel slippery
#12.

5. pH neutral- equal amounts of H+ and OH- ions
Ex: water
neutralize- combining an acid and a base to form water
#13.

6. pH buffer- any substance that resists a change in pH
Many life biological reactions have a small pH range
Example: blood (pH 7.35 – 7.45)
buffering capacity- the ability to resist a change in pH
#14.
#15.