Which reactions take place near the sensing electrode of an electrochemical NO analyzer?
A) 2H₂O 4H⁺ + 4e- + O₂
B) O₂ + 4H⁺ + 4e- → 2H₂O
C) 4NO + 2H₂O + 2O₂ → 4HNO₃
D) NO + 2H₂O HNO₃ + 3H⁺+ 3e-

Question

Quizplus · Accepted Answer

An electrochemical NO analyzer consists of three electrodes immersed in an electrolyte solution that contains a highly conductive concentrated acid or alkali solution.The electrodes are separated from the gas sample to be analyzed by a semipermeable membrane.NO and NO₂,from the unknown gas sample,diffuse across a semipermeable membrane and react with the electrolyte solution near the sensing electrode.This generates electrons in the oxidation reaction: NO + 2H₂O HNO₃ + 3H⁺ + 3e-.

Which Reactions Take Place near the Sensing Electrode of an Electrochemical