Acidification Study Guide

3/16/15

Acid Rain

Gases dissolved in our atmosphere


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

Limestone: porous (holds water)

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)