A solution contains compound X, which is a weak base, and its conjugate acid, in a molar ratio of 1:3. The resulting solution has pH 10.46. Based on the ( Kb ) values below, which is compound X?
a) ( NH₃ ) (( Kb = 1.8 × 10⁻⁵ ))
b) ( CH₃NH₂ ) (( Kb = 4.4 × 10⁻⁴ ))
c) ( C₆H₅NH₂ ) (( Kb = 4.2 × 10⁻¹⁰ ))
d) ( H₂O ) (( Kb = 1.0 × 10⁻¹⁴ ))
