Describe and give examples of ionophore, ionogen, strong and waek electrolyte. Why is the charge density around a reference ion not zero when the whole solution is electroneutral? Explain succinctly the Debye-Huckel approach to their ionic-cloud theory. Mention the main steps involved in this theory as well as the assumptions involved in its development. Write the linearized Poisson-Boltzmann equation and the time-average spatial distribution of the excess charge density around a reference ion. What is the total ionic-cloud charge around a reference ion? Draw the variation of the electrostatic potential and the excess-charge density as a function of the distance from the central ion. What does K- 1 represent? Write expressions for the Debye-Huckel length, the total electrostatic potential, the potential due to the isolated central ion, and the potential due to the ionic cloud. What is the physical meaning of effective thickness of the ion atmosphere?