The main factor that controls the pH of seawater is CO2. Here's a step-by-step explanation:

1. Carbon dioxide (CO2) from the atmosphere dissolves into the seawater.
2. Once in the water, CO2 reacts with water (H2O) to form carbonic acid (H2CO3).
3. Carbonic acid is a weak acid. It partially ionizes in water to form bicarbonate ions (HCO3-) and hydrogen ions (H+).
4. The increase in hydrogen ions (H+) lowers the pH of the seawater, making it more acidic.
5. The ocean's buffering system can usually maintain a stable pH by using carbonate ions (CO3--) to neutralize the extra hydrogen ions. However, if there's too much CO2 entering the ocean, this buffering system can be overwhelmed, leading to ocean acidification.

So, while salinity and other factors can influence seawater pH to some extent, the primary controller is CO2.

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The main factor that controls the pH of seawater is CO2. Here's a step-by-step explanation:

1. Carbon dioxide (CO2) from the atmosphere dissolves into the seawater.
2. Once in the water, CO2 reacts with water (H2O) to form carbonic acid (H2CO3).
3. Carbonic acid is a weak acid. It partially ionizes in water to form bicarbonate ions (HCO3-) and hydrogen ions (H+).
4. The increase in hydrogen ions (H+) lowers the pH of the seawater, making it more acidic.
5. The ocean's buffering system can usually maintain a stable pH by using carbonate ions (CO3--) to neutralize the extra hydrogen ions. However, if there's too much CO2 entering the ocean, this buffering system can be overwhelmed, leading to ocean acidification.

So, while salinity and other factors can influence seawater pH to some extent, the primary controller is CO2.

Knowee AI · Accepted Answer

The main factor that controls the pH of seawater is CO2. Here's a step-by-step explanation:

1. Carbon dioxide (CO2) from the atmosphere dissolves into the seawater.
2. Once in the water, CO2 reacts with water (H2O) to form carbonic acid (H2CO3).
3. Carbonic acid is a weak acid. It partially ionizes in water to form bicarbonate ions (HCO3-) and hydrogen ions (H+).
4. The increase in hydrogen ions (H+) lowers the pH of the seawater, making it more acidic.
5. The ocean's buffering system can usually maintain a stable pH by using carbonate ions (CO3--) to neutralize the extra hydrogen ions. However, if there's too much CO2 entering the ocean, this buffering system can be overwhelmed, leading to ocean acidification.

So, while salinity and other factors can influence seawater pH to some extent, the primary controller is CO2.

What is the main factor that controls the pH of seawater?Group of answer choicesCO2H20Sodiumchloridesalinity

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