The [H₃O⁺] of a 0 $\times$ 10^-5):
A)2 $\times$ 10^-10 M
B)3 $\times$

Multiple Choice

The [H₃O⁺] of a 0.49 M solution of NH₄Cl in H₂O at 25°C is (K_b for NH₃ = 1.8 $\times$ 10^-5) :

A) 2.7 $\times$ 10^-10 M
B) 3.0 $\times$ 10^-3 M
C) 1.6 $\times$ 10^-5 M
D) 0.49 M
E) none of these