A 20 μm diameter microtube is 4 mm long and is subject to the flow of water at a temperature of 20°C. The water contains dissolved sodium chloride at 0.01 mol per liter. An electric potential...

A 20 μm diameter microtube is 4 mm long and is subject to the flow of water at a temperature of 20°C. The water contains dissolved sodium chloride at 0.01 mol per liter. An electric potential difference of 200 V is imposed over the length of the microtube. Calculate the pressure difference between the two ends of the microtube that would prevent any flow to occur. Assume that the zeta potential is 0.1 V.