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What is the pH of a solution prepared by mixing 25 ml of 0.5 HCN with...

What is the pH of a solution prepared by mixing 25 ml of 0.5 HCN with 75 ml of 0.20 NaCN. Ka = 6.2*10^-10 for HCN. Hint: remember to dilutions first.

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Expert Solution

HCN + NaCN is the buffer

25x0.5 75x0.20 mmoles

7.5/100 15/100 concentrations

the pH of this buffer is given by Hendersen equation as

pH = pKa + log [conjugate base] [acid]

= (10-log 6.2) + log 15x10-2/ 7.5x10-2

= 9.5086

queen_honey_blossom answered 2 years ago
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