Many buffers are polyprotic, such as carbonic acid. bicarbonate (hco3) has a pka of 10.33; while carbonic acid (hco3) has a pka of 6.35. use the henderson-hasselbalch equation to mathematically determine which form of this buffer predominates at ph 7.4 (homeostasis ph of blood). besides your mathematical answer, state the form that predominates too.

Carbonic acid/bicarbonate; bicarbonate  

Explanation:

H₂CO₃ + H₂O ⇌ H₃O⁺ + HCO₃⁻; pKₐ₁ =   6.35

HCO₃⁻ + H₂O ⇌ H₃O⁺ + CO₃²⁻;  pKₐ₂ = 10.33

The best buffer is one for which pKₐ ≈ pH.  

6.35 is closer to 7.4, so the carbonic acid/bicarbonate form of the buffer predominates

The pH of the blood is higher (more basic) than the pKₐ of carbonic acid, so its basic form (bicarbonate, HCO₃⁻) predominates.

if you mean hydrogen and oxygen then water is the product