1. Acids and Bases

2. Properties of Acids:

3. Properties of ACIDS: 1. tastes sour

4. Properties of ACIDS: 1. tastes sour 2. reacts with metals

5. Properties of ACIDS: 1. tastes sour 2. reacts with metals 3. Turns blue litmus paper -- pink

6. Properties of ACIDS: 1. tastes sour 2. reacts with metals 3. Turns blue litmus paper -- pink 4. Produces hydrogen ions when mixed with water

7. Properties of Bases:

8. Properties of BASES: 1. tastes bitter

9. Properties of bases: 1. tastes bitter 2. Feels slippery

10. Properties of bases: 1. tastes bitter 2. Feels slippery 3. turns pink litmus paper blue

11. Properties of bases: 1. tastes bitter 2. Feels slippery 3. turns pink litmus paper blue 4. Produces hydroxide (OH - ) ions when mixed with water

12. Some people think that acids and bases are opposites.

13. pH

14. indicator – substance which changes color when it touches an acid or a base

15. example: litmus paper

16. example: litmus paper pH paper

17. We need a way to tell if acids or bases are strong or.

18. pH scale: --tells the concentration of hydrogen ions in a substance

19. pH scale: --tells the concentration of hydrogen ions in a substance --tells how acidic or basic a substance is

20. pH scale: --goes from 0 to 14

21. pH scale: --goes from 0 to 14 --acids have pH = 0 - almost 7 --bases have pH = over 7 - 14

22. pH scale: --goes from 0 to 14 --acids have pH = 0 - almost 7 --bases have pH = over 7 – 14 --Water is and has a pH =.