CHmeistry Help?

Question

Caffeine (C8H10N4O2) has a concentra-on of 0.30M.IfKb =4.1×10–4 what is the pH of this solution? 

 

Answer 1

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 .

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.