Determine the K_(a) for CH_(3)NH_(3)(+) at 25 deg C. The K_(b) for CH_(3)NH_(2) is 4.4 times 10⁻⁴.
1) 3.1 times 10⁻¹⁰
2) 2.3 times 10⁻³
3) 6.8 times 10⁻¹¹
4) 2.3 times 10⁻¹¹
5) 5.6 times 10⁻⁴