Science Quiz: 4.9-Acidification Lab
By: Zia Pirani
4.9 Notes, Limestone/Sinkhole, Ocean Acidification
-Carbon Dioxide, Sulfur Dioxide, Hydrogen Chloride
2. True or False: The three gases mentioned above create an acidic solution?
3. What is Sulfur Dioxide?
4. What is Carbonic Acid?
-Dissolved carbon dioxide
5. When was Sulfuric Acid discovered?
-In the 8th century by an alchemist
6. Uses for Sulfuric Acid?
-Lead acid battery (cars); fertilizers; steel industry; dried fruit production
7. What is Limestone?
-it is porous (holds water), is soft, and is soluble in water
8. Why do Florida sinkholes occur?
-There is lots of limestone and lots of water underground (aquafer) and the land was once covered with ocean -> soft calcium deposits
9. What is normal ocean Ph?
10. How much has ocean Ph decreased?
-0.1 or 25%
11. Why is it bad that the ocean Ph has lowered?
-Animals with shells will not be able to make a shell because there is not enough calcium
-In the test tube it is filled with carbon dioxide. The CO2 is denser so it sinks
-In the other test tube upright the gas can't escape because it is more dense
-In the last test tube inverted the gas escapes
2. Magnesium and Acid
-Hydrogen is a light gas and rises out of the test tube
-In the test tube upright the gas escapes because it is light
-In the last test tube inverted the gas can't escape because it is light.
3. The "Pop"
-The gas is ignited and rushes out of the inverted test tube. It rubs against the glass and causes friction, which is why we could hear the sound.
Acidification of Water
-Phenol red changes color as you add carbon dioxide into water
-The carbon dioxide turns to carbonic acid lowering the Ph of the water
-Calcium tablet is more soluble in the cup with the straw
-The carbonic acid lowers Ph and dissolves calcium faster