Question

buffer system maintains the pH level of human blood.

• A. Bicarbonate
• B. Sodium borate
• C. Phosphate

Answer 1

The correct option is A Bicarbonate

A solution containing a weak acid and its conjugate base or vice versa is called a buffer solution. A buffer solution can keep the pH of a solution constant even with addition of a certain amount acid/base to the solution.
Carbonic acid $H_{2}C{O}_3$ which is a weak acid along with its conjugate base i.e, bicarbonate ion $HC{O}_3^{-}$ forms a buffer sytem. This buffer system is responsible for maintaining pH of human blood.