Step 1:

The concentration of the [C₈H₁₀N₄O₂] is 0.3 M.

k_b for [C₈H₁₀N₄O₂] is .

The chemical equation is .

Let us consider change in the concentration:  , then .

Initial Amount
Change in Amount
Equilibrium amount			\ \

Step 2:

Base ionization factor .

Concentration cannot be negative.

Concentration of .

Step 3:

Calculate pOH.

Calculate pH.

pH of the solution is 12.037.

Solution:

pH of the solution is 12.037.