The following data were obtained when a Ca2+ ion-selective electrode was immersed standard solutions whose ionic strength was constant at 2.0 M.

Ca2+(M) E(mV)

3.38*10^-5 -74.8

3.38*10^-4 -46.4

3.38*10^-3 -18.7

3.38*10^-2 +10.0

3.38*10^-1 +37.7

Prepare a calibration curve and find [Ca2+] if E = -22.5 mV (in M) and calculate the value of ß in the equation : response of CA2+ electrode:
E = constant + beta(0.05016/2) log A_Ca2+(outside)(15-8)