What Is the Value of K_a for the Methylammonium Ion

Multiple Choice

What is the value of K_a for the methylammonium ion, CH₃NH₃⁺? K_b(CH₃NH₂) = 4.4 × 10⁻⁴

A) 4.4 × 10 ⁻⁴
B) 4.8 × 10 ⁻⁶
C) 4.4 × 10 ⁻¹⁰
D) 2.3 × 10 ⁻¹¹
E) 4.4 × 10 ⁻¹⁸