Author Question: Which chemical reaction occurs within the Stow-Severinghaus electrode? a. CO2 + H2O H2CO3 H+ + ... (Read 38 times)

geodog55

  • Hero Member
  • *****
  • Posts: 530
Which chemical reaction occurs within the Stow-Severinghaus electrode?
 
  a. CO2 + H2O  H2CO3  H+ + HCO3
  b. O2 + 2H2O + 4e  4OH
  c. 4Ag  4Ag+ + 4e
  d. EH+ = 0.0615  pH

Question 2

In a partial pressure of oxygen (PCO2) electrode, carbon dioxide does which of the following?
 
  1. It reacts with potassium chloride.
  2. It reacts with water to form carbonic acid.
  3. It diffuses through a polyethylene membrane.
  4. It diffuses through a semipermeable Teflon membrane.
  a. 2 and 3 c. 1 and 4
  b. 1 and 3 d. 2 and 4



tjayeee

  • Sr. Member
  • ****
  • Posts: 329
Answer to Question 1

ANS: A
The Stow-Severinghaus electrode is the standard PCO2 electrode. Within the electrode, CO2 from the blood diffuses across the Teflon membrane and reacts with water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate. The reaction can be written as CO2 + H2O  H2CO3  H+ + HCO3. The hydrogen ions from the bicarbonate-buffered solution then diffuse across the glass electrode, and the pH of the solution is measured as it is in the pH electrode.

Answer to Question 2

ANS: D
A PCO2 electrode is basically a pH electrode covered with a carbon dioxidepermeable Teflon or silicone (Silastic) membrane. A bicarbonate-buffered solution is held between the Teflon mem-brane and the pH glass electrode by a nylon spacer. CO2 from the blood diffuses across the sem-ipermeable Teflon membrane and reacts with the water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

Did you know?

Medication errors are more common among seriously ill patients than with those with minor conditions.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

For a complete list of videos, visit our video library