What are the K_b expression and chemical equation for the reaction of aniline, C₆H₅NH₂, in water?

Identify the incorrect statement/s. 

(a) The smaller the pK_a of its conjugate acid, the weaker the base. 

(b) The smaller the value of its K_b, the weaker the base. 

(c) The smaller the value of its pK_b,  the weaker the base. 

(d) The larger the pK_a of its conjugate acid, the stronger the base. 

(e) The larger the value of its K_b, the weaker the base. 

(f) The larger the value of its pK_b, the weaker the base.

The diagram below illustrates the behavior of three acids, HA, HB, and HC, in aqueous solutions. Note that water molecules are not included in the diagram and hydrated protons are present as H⁺. Identify the acid that has the smallest acid dissociation constant (K_a)?

Alanine is an amino acid that can have both equilibria in water: 

H₂N⎯CHCH₃⎯COOH + H₂O ⇌ ⁺H₃N⎯CHCH₃⎯COOH + OH^- K_b = 7.4x10⁻⁵

H₂N⎯CHCH₃⎯COOH + H₂O ⇌ H₂N⎯CHCH₃⎯COO^- + H₃O⁺ K_a = 4.5×10⁻³

It forms a zwitterion by intramolecular proton transfer 

H₂N⎯CHCH₃⎯COOH ⇌ ⁺H₃N⎯CHCH₃⎯COO^-

Determine the equilibrium constant for the reaction using the given K_a and K_b values

What are the K_b values for CN^- and NO₂^- if K_a for HCN is 6.2 x 10^-10 and HNO₂ is 4.0 x 10^-4?

Arrange the following in decreasing base strength

H₃PO₄ (Ka = 7.1x10^-3)

HNO₃ (Ka = 2.4x10¹)

H₂S (Ka = 1.1x10^-7)

HClO (Ka = 2.9x10^-8)

Identify the strongest base between the ions N₃^– and BrO^–.