Chemistry · Ionic equilibrium: Weak and strong electrolytes, ionization of electrolytes
The of is The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles
The \( p K_{a} \) of \( \mathrm{HCN} \) is \( 9.30 . \) The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up the total volume of 500 \( \mathrm{ml} \) is:
- A. 9.30
- B. 7.30
- C. 10.30
- D. 8.30
Step-by-step solution
The solution is a buffer with equal concentrations of HCN and CN⁻ (since equal moles and same volume), so pH = pKa = 9.30.
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