Jawabanmu

2014-06-03T17:01:03+07:00
KCN + H2O = HCN + OH ...... [OH] = √(10^-14/5. 10^-10) . 0,2 = 2. 10^-3 ........ pOH = 3-log2. pH = 11+log2. semoga membantu. maaf berantakan . jadikan yg terbaik yaaa =]
tolog jabarkan reaksinya :)
dlm air : KCN = K+ + CN- . CN bereaksi dlm air , CN + H2O = HCN + OH . jadikan yg terbaik yaa
2014-06-03T17:07:11+07:00
Reaksi hidrolisis :
KCN ⇒ K⁺ + CN⁻
K⁺ + H₂O tdk dapat bereaksi
CN⁻ + H₂O ⇒ HCN + OH⁻

pOH = - log  \sqrt{ \frac{Kw}{Ka} [CN^{-}]  }
        = - log  \sqrt{ \frac{10⁻¹⁴}{5 × 10⁻¹⁰} [0,2] }
        = - log  \sqrt{4.10 ^{-6} }
        = - log 2 × 10⁻³
        = 3 - log 2
pH = 14 - pOH
     = 14 - (3 - log2)
     = 11 + log 2