The polarographic (Clark)electrode measures partial pressure of O₂ by: A) Detecting the presence of polarized light B) Measuring pH changes in an electrolyte exposed to O₂ C) Binding O₂ chemically to a heated wire D) Reducing O₂ molecules with a platinum cathode

Question

Quizplus · Accepted Answer

The polarographic (Clark) electrode measures partial pressure of a gas, such as O2, by reducing the gas molecules with a platinum cathode. As the gas is reduced, a current is generated proportional to the partial pressure of the gas. Option A is incorrect because polarized light is not used in this measurement. Option B is incorrect because measuring pH changes would not give information about the partial pressure of a gas. Option C is incorrect because the gas molecule cannot be bound chemically to a heated wire.

The Polarographic (Clark)electrode Measures Partial Pressure of O2 By

The Polarographic (Clark)electrode Measures Partial Pressure of O₂ By