Problem: Calculate [OH-], [H+], and the pH of 0.40 M solution of the following amine (the K  b values are found in the following table).a. aniline

For this problem, we are being asked to calculate the pH, H+, and OH^- concentration of 0.40 M Aniline

Establish the Kb expression of the dissolution of aniline and determine the pH using an ICE chart

We will solve this problem through these steps:

Step 1: Write an equation for the dissociation of aniline 

Step 2: Write an expression for the K_b

Step 3: Set up an ICE table to calculate the OH^- ion concentration.

Step 4: Calculate the pH of solution using OH^- ion concentration.

Step 1: Dissociation of aniline in solution.

NaHCOO is a weak base and dissociates partially in aqueous solution.

C₆H₅NH_{2 (aq)} + H₂O_(l) ⇌ C₆H₅NH₃⁺ (aq) + OH^-_(aq)                K_b = 3.8x10^-10

Step 2: K_b expression for NaHCOO 

The expression of K_b can be written like the equilibrium expression:

$\boxed{{\mathbf{K}}_{\mathbf{b}}\mathbf{ }\mathbf{=}\mathbf{ }\frac{\left[\mathrm{products}\right]}{\left[\mathrm{reactants}\right]}\mathbf{ }\mathbf{=}\mathbf{ }\frac{\left[{\mathrm{OH}}^{-}\right]\left[C_6{H}_5{\mathrm{NH}}_2\right]}{\left[C_6{H}_5{{\mathrm{NH}}_3}^{+}\right]}}$

Solids and liquids are not included in equilibrium expressions.