Strong Exchange
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02:28
Titration Calculations: Strong Acid - Strong Base
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2020
Calculating pH for Titration Solutions: Strong Acid/Strong Base A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows: (a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then: (b) Titrant volume = 12.50 mL.
08:52
Ion-Exchange Chromatography
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Ion-exchange chromatography is a type of chromatography that separates analytes based on charge. A column is used that is filled with a charged stationary phase on a solid support, called an ion-exchange resin. Strong cation-exchange chromatography preferentially separates out cations by using a negatively-charged resin while strong anion-exchange chromatography preferentially selects out anions by using a positively-charged...
01:23
Titration of a Strong Acid with a Strong Base
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2024
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
03:22
Strong Acid and Base Solutions
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2020
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions. On the other hand, a strong base is a compound that dissociates completely in an aqueous solution and produces hydroxide ions. For example, 0.015 M KOH, a group 1 metal hydroxide, will...
11:38
Heat Exchanger Analysis
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2023
Source: Alexander S Rattner and Christopher J Greer; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Heat exchangers transfer thermal energy between two fluid streams, and are ubiquitous in energy systems. Common applications include car radiators (heat transfer from hot engine coolant to surrounding air), refrigerator evaporators (air inside refrigerator compartment to evaporating refrigerant), and cooling towers in power plants...
FAQs
The stationary phase retains its permanent charge across a broad pH range, so its ability to attract oppositely charged species remains comparatively consistent as solution conditions change. This stability helps researchers maintain predictable retention behavior during chemical and biochemical workflows, supporting reproducible separation, purification, and analysis when the sample environment cannot be restricted to a narrow pH interval.
The two formats target opposite classes of charged species. Strong cation exchange uses negatively charged functional groups to retain positively charged ions or molecules, whereas strong anion exchange uses positively charged groups to retain anions. Selecting between them depends on whether the compounds of interest carry positive or negative charge under the chosen solution conditions.
Elution occurs when salt concentration or other solution conditions weaken the reversible electrostatic attraction between the charged stationary phase and the retained compound. As those interactions are disrupted, bound species leave the exchanger and can be collected for subsequent analysis or purification. Changing these conditions provides a way to control when charged compounds are recovered.
A typical workflow begins by selecting a cation- or anion-exchange stationary phase that complements the charge of the target species. The sample is then brought into contact with the exchanger so selected compounds are retained through electrostatic interactions. Adjusting salt concentration or solution conditions afterward releases the bound compounds, enabling their separation and collection.
This approach is useful when a mixture contains charged species that must be separated, purified, or analyzed. Supported targets include inorganic ions, peptides, proteins, and other charged molecules. Its permanently charged exchanger is especially relevant when researchers want consistent interaction behavior across a broad pH range in either chemical investigations or biochemical workflows.
Strong Exchange can distinguish compounds according to their reversible electrostatic interactions with a charged stationary phase. The resulting retention and release behavior supports separation of mixture components, recovery of selected compounds during purification, and examination of charged species during analysis. In chemistry, this makes the method relevant to both inorganic ion work and molecular studies involving peptides or proteins.