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4. [25 pts] Consider an electrochemical cell at room temperature, with two compart- ments of ionic solutions each containing KCl and NaCl with concentrations given in the table below. The two compartments are separated by a membrane that may be permeable to Na+ and Cl-, but is impermeable to all other ion types including K+. Two identical Ag/AgCl electrodes are inserted, one in each compartment. The GHK equation at room temperature is: 0 0 PNa[Na+). + PK[K+). + Pc[C1-]i Vm = 60 mV x log10 ( Pva (Na+); + P*[K*]; + Pa[CI]. [; V V2 SOL. 1 SOL. 2 NaCl 99 mmol/L 0 mmol/L 1 mmol/L 10 mmol/L SOL. 1 SOL. 2 (b) [10 pts] Now a positive 1 uA current is injected into the first solution (SOL. 1 1) through the leftmost (V1) electrode, and the same current exits the second solution (SOL. 2) through the rightmost (V2) electrode. Describe what hap- pens to the two electrodes and to the two solutions. You may assume the membrane is permeable to Cl