Question

The temperature-dependent form of the extended Debye-Huckel equation is where γ is the activity coefficient, ε is the dielectric constant of water (a unitless quantity), T is the temperature (in units of K), z is the charge of the ion, μ is the ionic strength (in units of mol/L), and α is the ion size parameter (in units of pm). The temperature-dependence of the dielectric constant is given by the equation where the temperature is in units of Kelvin. What is the value of the activity coefficient of Pb2 at 90.00°C when the ionic strength is 0.051 M?

Answer 1

where "Y" is the activity coefficient, "E" is the dielectric constant of water (a unitless quantity), T is the temperature (in units of K), z is the charge of the ion, u is the ionic strength (in units of mol/L), and a is the ion size parameter (in units of pm). The temperature-dependence of the dielectric constant is given by the equation

The ion size parameter for Pb+2 is 4.50*10^-10 m.
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