pH of saliva is in nature.

Solution:

• The pH of human saliva is slightly acidic and varies between 5.9- 7.0.
• It is produced by salivary glands that discharge its content in the oral cavity.
• The pH of saliva depends upon the concentration of electrolytes (sodium ion, potassium ion, calcium ions, and bicarbonate ions).

Final Answer: The pH of saliva is slightly acidic in nature,