Ocean pH and Acid-Base Chemistry

The video discusses the applications of acid-base chemistry, focusing on acid rain and ocean acidification. Acid rain is rain with a pH lower than 5, caused by pollutants like carbon dioxide and sulfur dioxide. It affects ecosystems, but limestone can mitigate its effects. Ocean acidification occurs as oceans absorb CO2, lowering pH and affecting marine life by reducing available carbonate for shell formation. The video highlights the historical shifts in ocean pH and their impact on marine ecosystems.

What are the two main applications of acid-base chemistry discussed in the video?

• Combustion and corrosion

• Photosynthesis and respiration

• Acid rain and ocean acidification

• Evaporation and condensation

What pH level is considered to be acid rain?

• Above 7

• Below 5

• Exactly 7

• Between 5 and 7

Which gas is primarily responsible for forming carbonic acid in rainwater?

• Methane

• Carbon dioxide

• Nitrous oxide

• Sulfur dioxide

How does calcium carbonate help mitigate the effects of acid rain?

• By increasing the pH of water

• By forming a protective layer on water bodies

• By releasing oxygen into the air

• By reacting with acidic water to form neutral compounds

What happens to ecosystems when acid rain affects a lake lined with granite?

• The acidity increases, affecting marine life

• The pH remains stable

• The lake dries up

• The lake becomes more alkaline

What is the usual pH level of the ocean before the impact of increased atmospheric CO2?

• Exactly 8

• A little more than 8

• Exactly 7

• Less than 7

How does increased CO2 absorption affect marine organisms?

• It has no effect on marine life

• It makes the ocean more alkaline

• It decreases the availability of minerals needed for shells

• It increases the availability of minerals

What is the dual impact of CO2 absorption in oceans?

• Increases pH and mineral availability

• Increases temperature and salinity

• Decreases temperature and salinity

• Decreases pH and mineral availability

How much did the ocean's pH decrease during the last major shift 56 million years ago?

• No change

• Just under half a pH unit

• Exactly 1 pH unit

• More than 1 pH unit

What was the effect of the historical pH change on marine life?

• No significant effect

• Drastic effect on marine life

• Increased ocean temperature

• Improved marine biodiversity