Science Study Guide

Acidification and Two Gases quiz - Brian Anderson

4.9 Acid Rain

Sinkholes/Limestone

Limestone: soft, porus, holds water

water soluble --> carbonic acid

Sinkholes are common in Fl. because:

-lots of limestone underground

-was covered by ocean in past

Sulfuric Acid Notes

-discovered in 8th century by Alchemist --> Alchemy "Chemistry"

Uses:

-Lead acid batteries (cars)

-Fertilizers

-Steel industry --> prevents rust corrosion

-Dired fruit production (hydrotropic)

Two Gases Lab

Postlab

In magnesium Carbonate and Acid test tube: CO2 - dense gas sinks

Upright test tube:

filled with CO2 - gas can't escape because CO2 sinks

Inverted test tube:

Gas can escape - test tube fills with air

In Magnesium and Acid test tube: Hydrogen - light gas rises

Upright test tube:

Gas escapes - test tube fills with air

Inverted test tube:

Gas can't escape - filled with Hydrogen

"Pop"

Gas is ignited and rushes out of test tube. Rubs against glass which causes friction (making a sound)

Flammable gas escapes downward

Errors

not waiting 30 seconds

unstopper before inverting

break surface water with test tube

don't collect full test tube of gas

air bubble in test tube

stoppers not tight

not keeping test tubes vertical

Acidification Post Lab

Notes

-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

-this is b/c the carbonic acid lowers ph and dissolves calcium faster

Errors

-not enough phenol red

-don't bubble water long enough

-2 cups don't have the same amount of water

Ocean Acidification

Ocean's ph was decreased by 0.1

-about 25% drop in ph

-Lower ph will cause shelled animals (shrimp, mollusks, etc.) to not be able to build a shell