What is the [H3O+] of a solution that is 0.010 M in aqueous NH3 and 0.030 M in NH4NO3?
a. 7.2 × 10^-6 M
b. 6.0 × 10^-6 M
c. 1.7 × 10^-9 M
d. 1.4 × 10^-9 M
e. 1.2 × 10^-9 M
Answer: C
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