Correct Answer - Option 4 : 7.5 to 8.4
The pH of seawater varies from 7.7 to 8.3. The ocean's average pH is around 8.1.
Ocean continues to absorb more co2, the pH decreases and the ocean becomes more acidic.
Important point:
pH of pure water = 7
pH of clean rain = 5.6
pH of acidic rain = 4.2 to 4.4
At pH of 4.2 all fishes die.
|
Substance
|
pH
|
|
Rainwater
|
6.0
|
|
Tear
|
7.4
|
|
Urine
|
4.8-8.4
|
|
Sea Water
|
7.7 to 8.3
|
|
Gastric Juice
|
1.0-3.0
|
|
Saliva
|
6.5-7.5
|
