posted by Anonymous .
a sample of 20.0 mL of 0.100 M HCN (Ka=6.2*10^-10) is titrated with 0.150 M NaOH.
a) what volume of NaOH is used in this titration to reach the equivalence point?
b) What is the molar concentration of CN- at the equivalence point?
c) What is the pH of the solution at the equivalence point?
d) What is the pH of this solution when only 6.667 mL of the 0.150 M NaOH is added to 20.0 mL of the 0.100 M HCN?