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The only incorrect information related with \( 0.09 \mathrm{M} \)
P solution of \( \left(\mathrm{NH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}\right) \) ethylenediamine (en)

W is \( \left(\mathrm{K}_{\mathrm{b} 1}=8.1 \times 10^{-5}, \mathrm{~K}_{\mathrm{b} 2}=7.0 \times 10^{-8}\right. \),
\( \log 3=0.48, \log 7=0.85) \)
(1) \( \mathrm{pH}=11.44 \)
(2) \( \left[\mathrm{enH}^{+}\right]=2.7 \times 10^{-3} \mathrm{M} \)
(3) \( \left[\mathrm{enH}_{2}^{2+}\right]=7.0 \times 10^{-8} \mathrm{M} \)
(4) \( \left[\mathrm{H}^{+}\right]=2.7 \times 10^{-3} \mathrm{M} \)
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