Ethylenediamine,

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Ethylenediamine, H2NCH2CH2NH2\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2, is a diprotic base with Kb1=1.1×10−6K_{b1}=1.1\times10^{-6} and Kb2=4.0×10−7K_{b2}=4.0\times10^{-7}. A 25.0 mL sample of 0.100 M ethylenediamine is titrated with 0.100 M HCl to the first equivalence point (only one proton added per molecule). Determine the pH of the solution at 25 ∘C25\,^\circ\text{C} at this point.

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