1)
millimoles of HClO = 21.9 x 0.456 = 9.9864
At equivalence point :
mmoles of acid = mmoles of KOH
9.9864 = 0.494 x V
V = 20.22 mL
here salt only remains.
salt concentration = 9.986 / (21.9 + 20.22) = 0.237 M
pH = 7 + 1/2 (pKa + log C)
    = 7 + 1/2 (7.46 + log 0.237)
pH = 10.42
2)
mmoles of HCN = 29.8 x 0.430 = 12.814
mmoles of KOH = 51.5 x 0.373 = 19.2095
HCNÂ Â +Â Â Â KOHÂ Â Â Â
-------->Â Â KCNÂ Â Â + H2O
12.8Â Â Â Â Â Â Â Â Â
19.2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
0Â Â Â Â Â Â Â Â Â Â Â Â
0
0Â Â Â Â Â Â Â Â Â Â Â Â Â Â
6.40Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
12.8
here strong base reamins.
[OH-] = 6.40 / 29.8 + 51.5 = 0.0787 M
pOH = 1.10
pH = 12.90
