Dimethylamine, (CH₃)₂NH, Is a Weak Molecular Base with a Value

Multiple Choice

Dimethylamine, (CH₃) ₂NH, is a weak molecular base with a value of 9.6 × 10^-4.for K_b. An aqueous solution contains 0.350 M (CH₃) ₂NH and 0.250 M (CH₃) ₂NH₂Cl per liter as the only solutes. If the K_sp of Mg(OH) ₂ is 7.1 × 10^-12, what is the maximum [Mg²⁺] that can coexist with these solutes in the solution?Hint: Use the Henderson-Hasselbalch formula to find the pOH of the solution, and then use that to find [OH^-].

A) 1.7 × 10^-7
B) 3.9 × 10^-6
C) 7.7 × 10^-6
D) 1.5 × 10^-5
E) 4.9 × 10^-3