Find the pHof a 0.600 M HCN solution(Ka= 4.9× 10–10).
(a)3.56
(b)4.77
(c)5.05
(d)6.25
(e)7.61
for weak acids
pH = 1/2 [pKa - log C]
C = 0.600 M
pKa = - log Ka = - log [4.9 x 10-10] = 9.3
pH = 1/2 [9.3 - log 0.6]
pH = 1/2 [9.31 + 0.222]
pH = 4.77
answer = option b = 4.77
Find the pHof a 0.600 M HCN solution(Ka= 4.9× 10–10). (a)3.56 (b)4.77 (c)5.05 (d)6.25 (e)7.61