Science Quiz: 4.9-Acidification Lab

By: Zia Pirani

4.9 Notes, Limestone/Sinkhole, Ocean Acidification

1. Which gases are dissolved in our atmosphere?

-Carbon Dioxide, Sulfur Dioxide, Hydrogen Chloride


2. True or False: The three gases mentioned above create an acidic solution?

-True


3. What is Sulfur Dioxide?

-Acid Rain


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?

-8.1-8.4


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

Two Gases

1. Magnesium Carbonate and Acid

-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.

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Acidification of Water

1. Phenol Red

-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

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