The pH of the buffer system that contains 0.2 M hydrocyanic acid (HCN) and 0.190 M sodium cyanide (NaCN) is 9.29
From the question given above, the following data were obtained:
pKa of HCN = 9.31
Concentration of HCN, [HCN] = 0.2 M
Concentration of NaCN, [NaCN] = 0.190 M
pH =?
The pH of the buffer system can obtain by using the Henderson-Hasselbach equation as illustrated below:
pH = pKa + log [salt] / [acid]
pH = pKa+ log [NaCN] / [HCN]
pH = 9.31 + log (0.190/ 0.2)
pH = 9.29
Therefore, the pH of the buffer system is 9.29
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