Find the relationship between voltage across the membrane

Question

The following membrane is permeable to Ca⁺⁺ and Cl.

(a) Write expressions for the flow of Ca⁺⁺ and Cl ions.

(b) Write an expression for the relationship between JCa and JCl.

(c) Find the equilibrium voltage.

(d) Find the relationship between voltage across the membrane and the concentration of CaCl₂ before equilibrium is reached.