A cobalt (ii) solution wants to be examined by titration with 0.0415 M EDTA solution at ph 6.0. What will be the concentrations of cobalt(ii) ions in a titration of 30.0 ml and 0.0193 M cobalt (II) solution if 

a)12ml 

b)equivalent volume,

c) 16 ml EDTA is used in these titrations (K f =2.82*10^ 16 )