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MAIN TOPICS OUTLINE3.2 WATER CHEMISTRY
3.21 Importance of Water
3.22 Unique Properties of Water
3.23 Acids and Bases
3.24 Acid precipitation ("Acid Rain")
LECTURE OBJECTIVES
AT THE END OF THIS LECTURE, YOU SHOULD BE ABLE TO:
1. Discuss why water is important.
2. List and describe the unique properties of water that make the molecule indispensable to living systems.
3. Explain the difference between an acid, a base, a salt and a buffer, and recognize that it is important that pH remains within natural limits (explain how these properties are related to hydrogen bonding).
4. List potential damage caused by acid precipitation, and recognize that changes in natural pH impacts natural ecosystems.
5. Define selected key terms.
QUIZ
1. _________________________________________________________________
2. _________________________________________________________________
3. _________________________________________________________________
• Explain the difference between an acid, a base, a salt and a buffer. Select from the following (write the answers on the lines below):
-- Substance or group of substances that tend to resist pH changes in a solution.
-- Substance having a sour taste that releases H+ ions in water.
-- Substance having a bitter taste that releases OH- ions in water.
-- Inorganic compound formed when an acid reacts with a base.
4. ____________________________________________________________________________________________
5. ____________________________________________________________________________________________
6. ____________________________________________________________________________________________
7. ____________________________________________________________________________________________
• Give the pH for the water solutions below. Select from the following pH values (write the answers on the lines below):
-- pH 1 -- pH 3 -- pH 5 -- pH 7 -- pH 9 -- pH 11 -- pH 13
8. Water: ________ 9. Coffee: ________ 10. Oven cleaner: __________ 11. Coke: __________
12. Stomach acid: _________ 13. Stomach antacids: _________ 14. Household ammonia: _________
• Explain in your own words the term “acid precipitation”:
15. ____________________________________________________________________________________________
________________________________________________________________________________________________
• List three potential damages caused by acid precipitation:
16. ____________________________________________________________________________________________
17. ____________________________________________________________________________________________
18. ____________________________________________________________________________________________
KEY TERMS
See separate page link on the learning tools page.
TRY THIS QUESTION:
Acids have a pH value
a. that is neutral
b. below seven
c. above seven
d. above ten
e. above twelve
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