1. Acids and Bases Notes

2. Scientists use a range of numbers, called a pH scale, to tell how acidic or basic a solution is.

3. The pH scale is the concentration of hydrogen ions in a given substance. Luckily as 7 th graders we are going to just stick to the basics.

4. On the scale..... Acids range from 0-6 A solution that tests 7 is neutral Bases range from 8-14

5. Base Neutral Strong Acid Strong Base Weak Acid Weak Base 123 4 5 678 9 10 11 12 1314 0 Acid

6. Acids have the following characteristics: *strong smell *sour taste (NEVER put anything in your mouth unless you know what it is!) *corrosive (eat away at other materials)

7. *react with metals *contain hydrogen *can burn or sting skin

8. *bitter taste (NEVER put anything in your mouth unless you know what it is!) Bases have the following characteristics: *feel slippery *do NOT react with metals

9. *can burn the skin *can dissolve things *can be poisonous *also referred to as alkaline

10. Properties of Acids & Bases Video Clip

11. You can test a solution to find out whether it is an acid or a base by using an indicator. An indicator is a compound that changes color in the presence of acids or bases.

12. The indicator's shade or color will vary depending on the strength of the acid or base. Indicators include: *cabbage juice *litmus paper *pH paper

13. IndicatorWhen put in an acid, will turn this color When put in a base, will turn this color Neutral Cabbage JuicePINKGREENPURPLE Litmus PaperBlue paper turns red Red paper turns blue pH PaperRed/OrangeDark Green/BlueYellow

15. Indicators of Acids & Bases Video Clip

16. BrainPop!

17. CLICK!

19. Click here to go to the Alien Juice Bar. Click here to go to ZOOM Kitchen Chemistry.