# What are the buffering components of a bicarbonate buffer?

## What are the buffering components of a bicarbonate buffer?

The carbonic acid – bicarbonate buffer system consists of carbonic acid, a weak acid, and the bicarbonate anion, its conjugate base.

What is the pKa of bicarbonate buffer?

Bicarbonate has a pKa of 10.3, which is NOT ideal in normal physiologic conditions. In fact, the pH range of effectiveness is probably ~ 5.1 – 7.1 for the bicarbonate buffer system.

What are the 3 components of buffer solutions?

A buffer solution is made up of a weak acid and its conjugate base or a weak base and its conjugate acid.

### How does the bicarbonate buffer system buffer a strong acid?

When any acidic substance enters the bloodstream, the bicarbonate ions neutralize the hydronium ions forming carbonic acid and water. Carbonic acid is already a component of the buffering system of blood. Thus hydronium ions are removed, preventing the pH of blood from becoming acidic.

What is the pKa of carbonic acid?

The reported values for carbonic acid are pKa1 = 6.37 and pKa2 = 10.32.

What is the pH of bicarbonate buffer?

The buffer capacity of pure bicarbonate solutions is pH dependent. It is highest around the pKa (∼6.4) and does practically not exist below a pH of 5.5 (16).

#### What is bicarbonate buffer?

The bicarbonate buffer system is an acid-base homeostatic mechanism involving the balance of carbonic acid (H2CO3), bicarbonate ion (HCO − 3), and carbon dioxide (CO2) in order to maintain pH in the blood and duodenum, among other tissues, to support proper metabolic function.

What are the components of buffer system?

Components of a Buffer Solution. A buffer must contain one of two choices: a weak acid and its conjugate base or a weak base and its conjugate acid. The way that the components are chosen have to do with the desired pH of the solution.

What is the pKa for carbonic acid and bicarbonate?

## How do you find pKa values?

Calculate the pKa with the formula pKa = -log(Ka). For example, pKa = -log(1.82 x 10^-4) = 3.74.

What is the pKa of sodium carbonate?

Sodium carbonate is a strong alkaline compound with a pH of 11.6 for a 0.1M aqueous solution (The Merck Index, 1983; Johnson and Swanson, 1987). The pKa of CO3 2- is 10.33, which means that at a pH of 10.33 both carbonate and bicarbonate are present in equal amounts.

What is the PK of bicarbonate buffer?

Chemistry Bicarbonate (HCO3-) can reversibly bind a free hydrogen ion and in doing so acts as a buffer against pH changes (Review Buffer Basics). The pK of the bicarbonate buffer is 6.1, providing excellent buffering capacity around the normal ECF pH of 7.4.

### What is the role of the bicarbonate buffer system in other tissues?

In other tissues. The bicarbonate buffer system plays a vital role in other tissues as well. In the human stomach and duodenum, the bicarbonate buffer system serves to both neutralize gastric acid and stabilize the intracellular pH of epithelial cells via the secretion of bicarbonate ion into the gastric mucosa.

How do you make a bicarbonate buffer system?

Bicarbonate buffer system. Catalyzed by carbonic anhydrase, carbon dioxide (CO 2) reacts with water (H 2 O) to form carbonic acid (H 2 CO 3 ), which in turn rapidly dissociates to form a bicarbonate ion (HCO − 3 ) and a hydrogen ion (H +) as shown in the following reaction: