Hank's Buffer
Hank's Buffer - 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
0 Views •
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
0 Views •
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
Its controlled concentrations of sodium, potassium, calcium, magnesium, chloride, and phosphate help maintain an extracellular ionic environment compatible with cellular membranes. This reduces disturbances to osmotic balance and membrane function while tissue or cells are outside the body. In neural preparations, that support can limit stress caused by rinsing, dissociation, or other laboratory manipulations.
An isotonic solution helps prevent major water shifts across cell membranes during laboratory handling. Maintaining this balance is important because excessive swelling or shrinkage could compromise cellular integrity and alter the quality of a preparation. Hank’s Buffer therefore supports more consistent handling of neural tissue before downstream imaging, electrophysiology, or culture-related procedures.
When included, glucose contributes to the defined chemical environment surrounding cells, while phosphate is one of the ions supporting the solution’s overall composition. Hank’s Buffer may also provide short-term pH stability through its formulation. These features help preserve neural sample conditions during temporary handling, although the overview does not specify a single formulation or glucose concentration.
The solution supports sample integrity by combining osmotic balance, membrane-compatible ionic conditions, and short-term pH stability. Together, these properties reduce cellular stress while brain tissue or neural cells are manipulated outside the body. Better-preserved samples can contribute to more reproducible studies of neuronal signaling, development, and disease-related changes.
In neuroscience workflows, Hank’s Buffer can be used to rinse brain tissue, handle primary neural cultures, or prepare samples before imaging and electrophysiology. Its role is to maintain supportive conditions during these transitions rather than to serve as the experimental readout itself. Preserving sample condition before measurement helps researchers obtain more reliable observations of neural structure or function.
During dissociation, neural tissue is handled in a way that can impose cellular stress. Hank’s Buffer provides a defined extracellular environment while cells or tissue are being processed, helping maintain osmotic balance and membrane function during the procedure. This makes it useful for preparing neural cells for primary culture and for subsequent studies of signaling, development, or disease.