1. pH scale Presented by: Kallie Goins

2. What is a pH scale? It is a scale to measure how acidic or basic a liquid is pH scale focuses on concentrations of hydrogen ions (H+) and hydroxide ions (OH-)

3. Continue with the pH scale The scale goes from values very close to 0 through 14 Pure water is a 7 (right in the middle) on the scale Acids are found between 0 to 7 Bases are between 7 to 14

4. What are Acids and Bases Acids- are ionic compounds (a compound with a negative or positive charge) that break apart in water to form a hydrogen ion Ex. vinegar, citrus fruits, and stomach acids Bases- are ionic compounds that break apart to form a negatively charged hydroxide ion in water Ex. lye (sodium hydroxide), ammonia

5. What is a base Bases- are ionic compounds that break apart to form a negatively charged hydroxide ion in water. Ex. lye (sodium hydroxide), ammonia

6. What are neutrals? A neutral is neither an acid or a base. It is a 7 on the scale If something is 6.9 it is considered an acid If something is a 7.1 it is considered a base

7. acids These are lemons they are an acidic

8. Neutral This is a frozen fresh water, waterfall This is a neutral it is neither a acid or base

9. Basic Lye is a basic if you get it on you it can give you severe burns.

10. This is a pH scale Stomach acid, coke, battery acid, vinegar, and rain water are acids. Baking soda, ammonia, and NaOH are bases

11. So what about bleach Bleach is a base The reason bleach is slippery is because it is taking fat out of your skin That is why it is hard to wash bleach off your skin because oil from the fat and water don't mix

12. Bases and acids continued Bases taste bitter, feel slippery, and some bases can be very dangerous and burn your skin. Acids taste sour, react strongly with metals, and some acids can burn your skin and be very dangerous.

13. Acids continued Acids taste sour, react strongly with metals, and some acids can burn your skin and be very dangerous.

14. Picture resources http://en.wikipedia.org/wiki/Waterfall http://en.wikipedia.org/wiki/Lemon http://en.wikipedia.org/wiki/Lye http://www3.oes.edu/ms/science6/Pictures%2 0of%20Science%20Concepts/Forms/DispFor m.aspx?ID=8

15. Information resources http://www.chem4kids.com/files/react_acidbas e.html http://www.chem4kids.com/files/react_acidbas e.html http://staff.jccc.net/PDECELL/chemistry/phscal e.html http://staff.jccc.net/PDECELL/chemistry/phscal e.html http://www.elmhurst.edu/~chm/vchembook/18 4ph.html http://www.elmhurst.edu/~chm/vchembook/18 4ph.html