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A solution has initially \( 0.1 \mathrm{M}-\mathrm{HCOOH} \) and
P
\( 0.2 \mathrm{M}-\mathrm{HCN} \). The value of \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{HCOOH} \)
W \( =2.56 \times 10^{-5}, \mathrm{~K}_{\mathrm{a}} \) of \( \mathrm{HCN}=9.6 \times 10^{-10} \).
The only incorrect statement for the solution is \( (\log 2=0.3) \)
(1) \( \left[\mathrm{H}^{+}\right]=1.6 \times 10^{-3} \mathrm{M} \)
(2) \( [\mathrm{HCOO}]=1.6 \times 10^{-3} \mathrm{M} \)
(3) \( \left[\mathrm{CN}^{-}\right]=1.2 \times 10^{-7} \mathrm{M} \)
(4) \( \mathrm{pOH}=2.8 \)
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