a pH meter measures the concentration of hydronium ions, H3O+ in solution throug

Question

a pH meter measures the concentration of hydronium ions, H3O+ in solution through the creation of a concentration differential between a standard hydrogen half cell inside the pH probe and the concentration of hydronium ions outside the probe. If a pH meter reads a pH of 2.000 in a solution that is 25.0 degrees C, then the hydronium ion concentration of the solution being measured is 1.00 X 10^-2 M. What is the voltage being read by the pH meter? (note: both the anode and the cathode are inactive silver metal)

Explanation / Answer

the answer is 0.69 V , since both the electrodes are hydrogen electrode Ecell = 0; so it is a concentration cell where the voltage is depends on the concentration of the H3O+ ions ; so the ratio of conc of H3O+ ions is 10^5. so the ans is 0.69V

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