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CBSE Class 12-science Answered

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Asked by singlageetu287 | 16 Sep, 2023, 04:22: AM
answered-by-expert Expert Answer
Dear Student,
 
KCN       +         HCl        →        HCN
400 ×0.1        200× 0.1
40  mmol            20 mmol
 
Thus, HCl is limiting agent and hence, 20 mmol of HCN is produced.
The final mixture contains 20 mmol of HCN produced and 40 - 20 = 20 mmol of unuse KCN.
Given, pka for HCN = 6
pH = pka + log (salt/acid)
     = 6 + log (20/20)
     = 6 + 0
pH = 6  
Answered by | 17 Sep, 2023, 10:59: AM

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