If the pH is 3.94 what is the concentration of H

If pOH is 3.05, pH is 10.95 or

[H+]=1.122⋅10-11 mol/L

Explanation:

pH=-log (H+) Now, what is H+

if your pH is 10.95 (since pH+pOH=14, your pH=10.95).

(H+) = 10 - 10.95

(H+) = 1.122⋅10 - 11

This is your hydrogen ion concentration: [H+]=0.00000000001122 mol/L