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4) A highly toxic hydrogen cyanide ( HCN) is a weak acid. A chemical engineer plans to determine pH of a 50mL sample of HCN(0.10M)

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4) A highly toxic hydrogen cyanide ( HCN) is a weak acid. A chemical engineer plans to determine pH of a 50mL sample of HCN(0.10M) in a titration process. To this end, she used 0.20MNaOH as a titrant in varying volumes. Calculate the pH of the solution at the following points: (Ka for HCN=6.21010) (a) Before addition of NaOH (initial pH ), (b) After 10.00mL of titrant addition, (c) After 25.00mL of titrant addition, (d) After 50.00mL of titrant addition

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