Also known as magnesium diacetate, ACETIC ACID, MAGNESIUM SALT, Magnesium di(acetate), Mg Acetate
Magnesium Acetate, also known as magnesium diacetate, is a magnesium salt of acetic acid with the molecular formula C4H6MgO4 and molecular weight 142.39. It is supplied as a defined chemical material for appropriate laboratory, research and industrial use.
Magnesium Acetate, also known as magnesium diacetate or acetic acid magnesium salt, is an inorganic salt formed from magnesium and acetate ions. Its molecular formula is C4H6MgO4, and its stated molecular weight is 142.39. The CAS number is 142-72-3. This identity describes the anhydrous compound; hydrated forms, including magnesium acetate tetrahydrate, have different molecular compositions and molecular weights.
As a magnesium carboxylate, the material combines an ionic magnesium centre with acetate groups and can participate in aqueous acid-base and ion-exchange chemistry. Its behaviour depends on concentration, temperature, water content and the surrounding formulation. Solutions may provide magnesium and acetate species, while heating can affect hydration state. Actual appearance, solubility and handling characteristics should be confirmed for the selected material.
Magnesium Acetate is encountered in laboratory preparations, chemical processing, buffering-related work and selected industrial formulations where a soluble magnesium source or acetate salt is appropriate. It may also appear in educational demonstrations and research involving magnesium compounds. A listed application indicates a recognised area of use, not automatic suitability for food, pharmaceutical, agricultural or other regulated purposes.
Selection should begin with the required chemical form, especially the distinction between anhydrous material and a hydrate. Users should then assess intended concentration, solvent system, water sensitivity, impurity limits, analytical method and process compatibility. Storage, handling and workplace controls should follow the applicable safety documentation and local requirements. Product suitability remains dependent on the grade, specification and end-use evaluation. For commercial selection, the compound name should be considered separately from the specification and supplied form required for the intended process.
Technical profile
Product properties
Review the product identity and general physical profile before specifying the grade required for your operation.
IUPAC name
magnesium diacetate
Category
Inorganic Chemicals
Subcategory
Magnesium Salts
Molecular formula
C4H6MgO4
Molecular weight
142.39 g/mol
Uses and markets
Applications and industries
The correct product specification depends on the intended process, grade requirements and operating conditions.
Magnesium Acetate is the magnesium salt of acetic acid, commonly identified as magnesium diacetate. The anhydrous molecular formula is C4H6MgO4, with a stated molecular weight of 142.39 and CAS number 142-72-3. Buyers and formulators should distinguish this compound from hydrated forms, because water of crystallisation changes the formula, molecular weight and mass required for solution preparation.
In aqueous systems, the salt dissociates to magnesium-containing and acetate species, allowing it to participate in ionic, acid-base and coordination chemistry. Its practical behaviour can vary with water content, concentration, temperature and co-solutes. For accurate calculations, the chemical form named in the specification should match the form used in the process, especially when comparing anhydrous material with magnesium acetate tetrahydrate.
Functional Behaviour in Formulations
For Magnesium Acetate, the acetate component can contribute to a mildly acidic salt system and may support controlled pH adjustment when combined with suitable partners. Magnesium ions can interact with anions, ligands and formulation components, so compatibility should be assessed rather than assumed. Solubility, clarity and stability are influenced by temperature, ionic strength and the presence of competing salts or complexing substances.
During heating or drying, hydrated and anhydrous materials may behave differently because bound water can be released. This distinction matters in gravimetric work, concentration calculations and thermal processing. Users should establish suitable addition order, mixing conditions and concentration limits through documented testing, while consulting current safety information for handling, storage and protective measures.
Established Use Contexts
Laboratories may use Magnesium Acetate in analytical preparations, teaching demonstrations and research involving magnesium or acetate chemistry. Industrial users may consider it where a soluble magnesium salt is needed in chemical processing, formulation development or materials investigation. These contexts cover broad technical activities; they do not imply that every grade is suitable for a regulated, sensitive or performance-critical application.
In buffering studies, the acetate portion can be relevant to pH-control systems, while the magnesium portion may influence ionic balance and downstream reactions. Process designers should evaluate the complete formulation, including water quality, temperature, contact materials and other reagents. Food, pharmaceutical, personal-care and agricultural uses require separate regulatory, compositional and application-specific assessment before adoption.
Selection and Process Considerations
The first selection decision is the chemical form: anhydrous Magnesium Acetate and hydrated material should not be treated as interchangeable by mass. Review the declared formula, molecular weight, water content, impurity profile and analytical basis before preparing solutions or comparing batches. The intended solvent, concentration range and reaction environment should also be included in the technical assessment.
Operational planning should address dust control, accurate weighing, dissolution sequence, solution labelling and protection from unsuitable storage conditions. Compatibility with metals, polymers, seals and neighbouring ingredients may require testing. Local workplace rules and end-use regulations remain controlling, and users should rely on the applicable technical and safety documentation rather than infer suitability from the chemical name alone.
Frequently asked questions
Questions about Magnesium Acetate
How does anhydrous Magnesium Acetate differ from magnesium acetate tetrahydrate?
Anhydrous Magnesium Acetate contains no stoichiometric water of crystallisation, whereas magnesium acetate tetrahydrate contains four water molecules associated with each formula unit. The two forms therefore have different molecular formulas, molecular weights and mass requirements for preparing a target molar concentration. They can also differ in physical behaviour during storage, dissolution, heating and drying. A calculation based on the anhydrous molecular weight should not be applied directly to the tetrahydrate. Before use, confirm which form is named in the product documentation and process specification. If a hydrate may lose water during handling or heating, account for that possibility in analytical and manufacturing controls.
What happens when Magnesium Acetate dissolves in water?
When Magnesium Acetate dissolves in water, it separates into hydrated magnesium-containing species and acetate-containing species. The exact solution behaviour depends on concentration, temperature, water quality and other dissolved components. The acetate system can influence acidity and buffering response, while magnesium may interact with carbonate, phosphate, hydroxide, chelating agents or other anions. These interactions can affect clarity, precipitation or measured pH. Dissolution should therefore be evaluated in the actual solvent and formulation rather than assumed from a simple water test. For quantitative work, use the correct chemical form, allow adequate mixing and verify the final concentration with an appropriate analytical method.
Can Magnesium Acetate be used as a buffer?
Magnesium Acetate can contribute to an acetate-based pH-control system, but it is not automatically a complete buffer by itself. Effective buffering generally depends on the balance between a weak acid and its conjugate base, along with the required pH range, concentration and ionic environment. Magnesium ions may also interact with other ingredients and alter solution behaviour. A formulation developer should select the acid-base pair deliberately, measure pH under representative conditions and assess stability over the intended temperature range. The resulting system may be useful for a particular process, but suitability must be demonstrated for the specified composition and end use.
What chemical compatibility issues should be considered with Magnesium Acetate?
Compatibility depends on the complete formulation, not only on the magnesium acetate name. Magnesium ions can react with or associate with carbonate, phosphate, hydroxide and some complexing or chelating substances, potentially producing cloudiness, precipitation or altered availability. Concentrated solutions may also behave differently from dilute systems. Evaluate the order of addition, solvent composition, temperature, pH and residence time during compatibility studies. Contact materials, seals and process equipment should be reviewed when solutions are heated or held for extended periods. Small-scale testing with representative ingredients can identify visible changes, pH drift or concentration loss before wider process use.
Why is molecular weight important when preparing Magnesium Acetate solutions?
Molecular weight determines how much material is required to prepare a specified molar concentration. Magnesium Acetate identified as the anhydrous compound has a different molecular weight from magnesium acetate tetrahydrate, because the hydrate includes additional crystallisation water. Using the wrong value can create a systematic concentration error even when weighing is accurate. Confirm the chemical form and stated molecular weight before calculation, then account for assay or water-content information when the application requires precise composition. After preparation, appropriate checks such as mass balance, density, titration or another validated analytical approach may help confirm the intended solution strength.
Where is Magnesium Acetate commonly considered in technical work?
Technical users commonly consider Magnesium Acetate for laboratory analysis, research involving magnesium or acetate chemistry, selected chemical-processing operations and certain pH-control studies. It may also be used in educational demonstrations or formulation screening when its ionic composition is relevant. These broad contexts do not establish suitability for every product or regulated sector. The appropriate choice depends on the required chemical form, impurity limits, concentration, solvent, process conditions and applicable rules. A user should evaluate the complete formulation and intended function, then confirm performance and compliance through suitable technical testing before incorporating the material into a finished process or product.
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