1. Acids, Bases, and the pH scale

2. Acids Acids pH of 0 - < 7 pH of 0 - < 7 React with metals and Bases React with metals and Bases Tend to taste sour Tend to taste sour Give off/ contribute H + ions into a solution Give off/ contribute H + ions into a solution Ex.) HCl  H + (aq) + Cl - (aq) Ex.) HCl  H + (aq) + Cl - (aq) (aq) stands for aqueous, which means it is a solution in which the solvent is water (dissolved in water) (aq) stands for aqueous, which means it is a solution in which the solvent is water (dissolved in water)

3. Acids… There is a very strong acid in our stomach, HCl. This is what sometimes cause heartburn. There is a very strong acid in our stomach, HCl. This is what sometimes cause heartburn.

4. Bases Bases pH of >7 - 14 pH of >7 - 14 Do not react with metals Do not react with metals React with acids React with acids Tend to taste bitter Tend to taste bitter Give off/ contribute hydroxide ions ( OH - )to a solution Give off/ contribute hydroxide ions ( OH - )to a solution ex.) NaOH  Na + (aq) + OH - (aq) ex.) NaOH  Na + (aq) + OH - (aq)

5. Neutral Neutralization pH of 7 pH of 7 Neither acidic nor basic Neither acidic nor basic Pure water Pure water We can neutralize an acid with a base, or neutralize a base with an acid. We can neutralize an acid with a base, or neutralize a base with an acid. Ex.) There are bases secreted in our intestines that neutralize the acid from our stomach. Ex.) There are bases secreted in our intestines that neutralize the acid from our stomach.

6. The pH Scale A scale developed in order to determine how acidic or basic a substance is. A scale developed in order to determine how acidic or basic a substance is. Values on the scale range from 0-14. Values on the scale range from 0-14.

7. Indicator A substance that changes color in the presence of an acid or base. A substance that changes color in the presence of an acid or base. Ex. Cabbage Juice, litmus paper Ex. Cabbage Juice, litmus paper

9. The pH Scale…