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\( 2.5 \mathrm{~mL} \) of \( 2 / 5 \mathrm{M} \) weak monoacidic base \( \left(\mathrm{K}_{\mathrm{b}}=1 \times 10^{-12}\right. \)
\( \mathrm{P} \)
at \( 25^{\circ} \mathrm{C} \) ) is titrated with \( 2 / 15 \mathrm{M} \mathrm{HCl} \) in water at \( 25^{\circ} \mathrm{C} \). The concentration of \( \mathrm{H}^{+} \)ion at equivalence point is: \( \left(\mathrm{K}_{\mathrm{w}}=1 \times 10^{-14}\right. \) at \( \left.25^{\circ} \mathrm{C}\right) \)
(1) \( 3.7 \times 10^{-13} \mathrm{M} \)
(2) \( 3.2 \times 10^{-7} \mathrm{M} \)
(3) \( 3.2 \times 10^{-2} \mathrm{M} \)
(4) \( 2.7 \times 10^{-2} \mathrm{M} \)


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