1. Bases Bases…what are they?  A compound that increases hydroxide ions in water  Have a bitter flavor, feels slippery, and can conduct electricity  Bases neutralize acids and acids neutralize bases  Common in everyday life (used in soaps and detergents) Notes SPI 0807.9.12 Acids and Bases Press the Right Arrow Button to Advance through the Presentation!

2. Base Uses  Toothpaste  Detergent  Ammonia  Acid reducers 2 Notes

3. Number your paper from 1 to 12. Then fill in the blanks using the following words… slippery, hydroxide, bases, compound, bitter ( 1) A base is a __________that increases the number of _____________ions. (2) Bases have a ______ flavor (3) _________ neutralize acids. (4) Bases feel __________. compound SPI 0807.9.12 Acids and Bases Review Questions hydroxide bitter Bases slippery

4.  pH scale: a way to determine the level of acidity or basicity of a substance. (tells you how strong or weak an acid or base is)  Bases are 7.1 to 14 on the pH Scale  7 is neutral (pure water is 7) 4 Notes SPI 0807.9.12 Acids and Bases The pH Scale Bases are 7.1 to 14

5. More About The pH scale  Again…bases are 7.1 to 14  With bases, the higher the number…the stronger the base Example: a base with pH 14 is stronger than a base with pH 10 5 Notes SPI 0807.9.12 Acids and Bases pH 14 is stronger than pH 10

6. More About the pH scale  The pH scale can be displayed different ways.  Yet the ranges for acids and bases stays the same (0 to 6.9 for acids, 7.1 to 14 for bases) 6 Notes pH Scale Vertical (top to bottom) Horizontal (left to right) Horizontal (right to left) pH Scale Vertical (bottom to top)

7. Fill in the blanks using the following words… higher, 7.1 to 14, strength, pH 13 ( 5) Which base is stronger, pH 13 or pH 8? ____________. (6) The pH scale tells you the _________ of acids and bases. (7) With acids the lower number is stronger. Yet with bases the _________ number is stronger. (8) The pH range for bases is _________? pH 13 SPI 0807.9.12 Acids and Bases Review Questions strength higher 7.1 to 14

8. Bases and Indicators  Bases Change Colors in Indicators like litmus paper or phenolphthalein or bromthymol blue or cabbage juice Notes

9. 9 - Bases turn Red litmus paper Blue. -Acids turns Blue litmus paper Red Notes SPI 0807.9.12 Acids and Bases  Again…bases change colors in indicators  One common indicator is litmus paper (see picture below) More About Bases and Indicators

10. Fill in the blanks using the following words… blue, Indicators, No, acids (9) ___________ change color in acids or bases 10) Bases turn red litmus paper ______. (11) ________ turn blue litmus paper red. (12) Is litmus paper the only kind of indicator? ______ Indicators SPI 0807.9.12 Acids and Bases Review Questions blue Acids No