Hemoglobin Buffering
Hemoglobin Buffering - Related Videos
02:56
Buffers
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2020
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
04:35
Buffers - Concepts
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2020
Buffers When an Arrhenius acid (HA) is added to water, it dissociates into its conjugate base (A-) and a hydrogen cation (H+). HA + H2O → H+(aq) + A-(aq) The amount of hydrogen ions present in the solution determines the acidity of the solution, where more hydrogen ions indicate a lower or more acidic pH. Similarly, when a strong Arrhenius base (BOH) is added to water, it dissociates into its conjugate acid (B+) and a hydroxide ion (OH-). BOH + H2O → B+(aq) + OH-(aq) Generally, the addition of...
14:31
Buffers - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparing 50 mM NaH2PO4 Buffer, pH 7Expand In the first part of this experiment, you will prepare a sodium phosphate solution buffered at pH 7.0. Monosodium phosphate is a weak acid with the conjugate base, disodium phosphate. Unadjusted monosodium phosphate solutions usually have a pH of about 4 - 6. Buffers are most effective close to their pKa, which is 6.8 to 7.2 for monosodium phosphate. So, you will use NaOH to push the...
08:13
Buffers - Instructor Prep
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Preparation of SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. To set up for this lab experiment, wear the appropriate personal protective equipment, including a lab coat, chemical splash goggles, and gloves. All solutions for this lab should be prepared in a chemical fume hood. Prepare 100 mL of a 1 M NaOH solution. Note:...
01:09
Buffers: Buffer Capacity
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2025
Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH. In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak acid...
FAQs
The oxygenation state of hemoglobin determines how it handles hydrogen ions during circulation. In metabolically active tissues, deoxygenated hemoglobin binds many hydrogen ions produced alongside bicarbonate formation, limiting the immediate fall in blood pH. In the lungs, oxygenation reverses this relationship, preparing the bound ions for removal through carbon dioxide exhalation.
When hemoglobin becomes oxygenated in the lungs, it releases hydrogen ions that can combine with bicarbonate. This reaction reforms carbonic acid, which is converted to carbon dioxide and then exhaled. The sequence links oxygen uptake to acid removal, so pulmonary gas exchange helps restore conditions altered while blood passed through tissues.
Carbon dioxide generated in tissues enters a linked chemical pathway that produces hydrogen ions and bicarbonate. By binding many of the hydrogen ions, hemoglobin supports continued conversion of tissue carbon dioxide into a transportable bicarbonate form. In this way, buffering contributes both to acid-base homeostasis and to movement of carbon dioxide toward the lungs.
Start with carbon dioxide production in tissues, followed by its conversion to carbonic acid and dissociation into hydrogen ions and bicarbonate. Next, track hydrogen-ion binding by deoxygenated hemoglobin in red blood cells. At the lungs, oxygenation promotes ion release, bicarbonate is converted back toward carbon dioxide, and exhalation completes the sequence.
Within biology, the process provides a bridge among tissue metabolism, circulation, and respiration. Tissue metabolism supplies carbon dioxide, circulation links tissues and lungs, while respiration removes carbon dioxide in the lungs. Hemoglobin buffering keeps these stages chemically connected, allowing gas exchange to occur while blood pH remains more stable.
It helps maintain stable blood pH while tissues produce carbon dioxide and blood moves between tissues and lungs. The mechanism does not isolate acid-base regulation from gas exchange; instead, hydrogen-ion binding, bicarbonate formation, oxygenation, and exhalation operate as one linked system. This integration supports physiological acid-base homeostasis during respiration and tissue metabolism.