Quiz 4.9
Acidification and Two Gases Labs
Gases Dissolved in Our Atmosphere
- carbon dioxide, sulfur dioxide, and hydrogen chloride all create an acidic solution
- carbonic acid -----> dissolved carbon dioxide
- sulfur dioxide -----> "acid rain"
-volcanoes -kill forests
-industrial pollution -pollute water (rivers, lakes, ponds)
Sinkholes/Limestone
Limestone:
- soft and porous (holds water)
- water soluble -----> carbonic acid
Sinkholes:
- common in Florida because:
-lots of limestone
-was once covered by ocean
Sulfuric Acid
- discovered in the 8th century by alchemists -----> Alchemy -----> "chemistry"
Sulfur Acid:
- uses:
-lead acid batteries (cars)
-fertilizers
-steel industry -----> prevents rust corrosion
-dried fruit production (hydrotropic)
Two Gases
Magnesium Carbonate and Acid:
- Carbon dioxide sinks (dense)
- the upright test tube is filled with CO2 and the gas can't escape
- the inverted test tube is filled with air and the CO2 escapes
Magnesium and Acid:
- Hydrogen rises (light)
- the upright test tube is filled with air because the hydrogen escapes
- the inverted test tube is filled with hydrogen because the gas can't escape
"Pop":
- gas is ignited and rushes out of the test tube
- gas rubs against glass and causes friction (sound)
- the flammable gas is escaping
Acidification of Water
- 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 the straw
-because the carbonic acid lowers ph and dissolves calcium faster
Ocean Acidification
- ocean's ph has decreased 0.1
-about 25% drop in ph
- lower ph will cause shelled animals (shrimp, mollusks, etc.) to not be able to produce shells