The gastric H+ pump found in the plasma membrane of gastric mucosa cells maintains a cytostolic concentration of K+ of 145 mM and an H+ concentration of 3.16x10^-8 M. In the stomach, the concentration of K+ is 10mM and the H+ ion concentration is 0.15 M.
What is the pH of the cytosol of gastric mucosa cells and what is the pH of the stomach?
What is the change in free energy of transporting 1 mol of H+ from the cytosol into stomach at 37 degrees Celsius? F=96500 J/molV, R=8.3145 J/molK. The transmembrane electrical potential is +70 mV (cytosol to stomach).