18. Aqueous Equilibrium - Part 2 of 3
18. Aqueous Equilibrium / Titrations: Diprotic & Polyprotic Buffers / Problem 13
A diamine is a compound that contains two amino groups and can accept two protons since each nitrogen in the compound can accept a proton. Propylenediamine (1-2-Diaminopropane), H2NC3H6NH2, is an example of a diamine:
H2NC3H6NH2(aq) + H2O(l) ⇌ H3NC3H6NH2+(aq) + OH−(aq) Kb1 = 6.61×10−5
H3NC3H6NH2+(aq) + H2O(l) ⇌ H3NC3H6NH32+(aq) + OH−(aq) Kb2 = 4.07×10−8
Determine the pH of the solution after the addition of the following volumes of 0.300 M HCl to 30.0 mL of 0.200 M propylenediamine.
(i) 0 mL
(ii) 10.0 mL
(iii) 20.0 mL
(iv) 30.0 mL
(v) 40.0 mL
(vi) 50.0 mL
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