Acidification Study Guide
3/16/15
Acid Rain
CO2 - create an acide solution
Sulfur dioxide - create an acid solution
Hydrogen Chloride - create an acid solution
Carbonic acid--> dissolved CO2
Sulfur dioxide--> "acid rain"
- volcanoes - Kill forest; Pollute water (river, lake, pond)
- industrial pollution
BQ's 32-35 (answers are online)
Everything Else
soft
soluble in water (carbonic acid)
Florida Sinkholes occur because:
- lots of limestone
- water underground (aquifer)
- once covered with ocean --> soft calcium deposits (dead animals)
Sulfuric Acid Notes
- discovered in 8th century by Alchemist- Alchemy "chemistry"
Uses:
- lead Acid batteries (cars)
- fertilizers
- steel industry--> prevents rust corrosion
- Dried fruit production (hydrotropic)
TWO GASES LAB:
Purpose: to collect and compare the gases produced by the reaction of sulfuric acid with both pure magnesium and magnesium carbonate
Post Lab:
Experimental Errors:
1. not waiting 30 seconds
2. unstopper before inverting
3. break surface water with test tube
4. don't collect full test tube of gas
5. air bubble in test tube
6. stoppers not tight
7. not keeping test tubes vertical
FRAES #36-45 omit 44--> answers are online
Phenol Red
- ph indicator
- red: basic
- clear: acidic
ACIDIFICATION of WATER
Purpose: To determine if we can change the acidity of water by dissolving CO2 from our lungs.
Post Lab:
- phenol red changes color as you add CO2 into water
- the CO2 turns to carbonic acid lowering the ph of the water
- calcium tablet is more soluble in cup with straw because the carbonic acid lowers ph and dissolves calcium faster
Experimental Errors:
1. not enough phenol red
2. don't bubble water long enough
3. 2 cups don't have same amount of water
4. lose water when using straw
5. Put CO2 into both cups
Ocean Acidification
- ocean's ph has decreased 0.1
- about 25% drop in ph
- lower ph will cause shelled animals (shrimp, mollusks, etc)
(normal ocean ph: 8.0- 8.4)