Author Question: What is the pH of the phosphate buffer solution in a Sanz electrode? a. 6.84 c. 7.32 b. 7.00 d. ... (Read 64 times)

j.rubin · **on:** Jul 16, 2018

What is the pH of the phosphate buffer solution in a Sanz electrode?

a. 6.84 c. 7.32
b. 7.00 d. 7.90

Question 2

Which reaction occurs at the platinum cathode of the Clark electrode?

a. CO2 + H2O H2CO3 H+ + HCO3
b. AgCl + KCl Ag2 + Cl2 + K
c. O2 + 2H2O + 4e 4OH
d. 4Ag 4Ag+ + 4e

jaymee143 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: A
The phosphate buffer solution in the pH electrode has a pH of 6.84.

Answer to Question 2

ANS: C
Oxygen from the blood sample diffuses across the semipermeable plastic membrane into the KCl solution and reacts with the platinum cathode, altering the conductivity of the electrolyte solu-tion. The platinum cathode donates electrons, which reduce oxygen to produce hydroxyl ions.