Three aqueous solutions of weak bases are each titrated with until exactly one mole…

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Three 0.10 M0.10\,\text{M} aqueous solutions of weak bases are each titrated with HCl\text{HCl} until exactly one mole of acid has been added per mole of base. The bases have the following KbK_b values: • Base X: 1.0×10−31.0\times10^{-3} • Base Y: 1.0×10−51.0\times10^{-5} • Base Z: 1.0×10−71.0\times10^{-7} After the respective equivalence points are reached, which solution will have the lowest pH? (a) Base X (b) Base Z (c) All three solutions will have the same pH (d) Base Y

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