Question

Predominant form of histidine at pH=0 is:
a) H⁺
b) H₂
c) H³⁺
d) H₄

Answer 1

The predominant form of histidine at pH=0 is H⁺.

Step-by-step explanation:

The predominant form of histidine at pH=0 is:

(a) H⁺

At low pH, such as pH=0, histidine exists primarily in its protonated form as H⁺. This is because the pH scale measures the concentration of hydrogen ions in a solution, and at low pH, there is an abundance of H⁺ ions. The other forms of histidine (H₂, H³⁺, and H₄) are not as prevalent at pH=0.