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Sodium Nitrate

Also known as Chile saltpeter, Cubic niter, Soda niter, Nitrate of soda

Sodium Nitrate is an inorganic nitrate salt with the formula NNaO3 and molecular weight 84.995. Also known as sodium nitrate, it is supplied for qualified industrial, technical and research applications subject to grade and regulatory requirements.

Inorganic Chemicals Nitrate Salts

Product identity

CAS number
7631-99-4
Molecular formula
NNaO3
Molecular weight
84.995 g/mol
Category
Inorganic Chemicals
Subcategory
Nitrate Salts

Product overview

What is Sodium Nitrate?

Sodium Nitrate is an inorganic nitrate salt composed of sodium and nitrate ions, with the molecular formula NNaO3 and molecular weight 84.995. It is identified by CAS number 7631-99-4 and is also known as Chile saltpeter, cubic niter, soda niter, and nitrate of soda. The supplied alias etabisulfite is retained as an identity reference, although naming should be confirmed before use.

As a crystalline ionic material, Sodium Nitrate is water-soluble and behaves as an oxidizing nitrate source in appropriate chemical environments. Its solution chemistry is governed by dissolved sodium and nitrate ions, while heating can produce decomposition products under suitable conditions. Moisture exposure, contamination, temperature, concentration, and contact with incompatible materials can influence storage behaviour and process outcomes.

Established industrial contexts include chemical synthesis, analytical work, pH-related formulations, glass and ceramic processing, and selected thermal or materials applications. It may also appear in food-related discussions, but any food, feed, pharmaceutical, or personal-care use depends on applicable legislation, formulation controls, and an appropriate regulated grade. A general industrial material should not be assumed suitable for those purposes.

Selection should begin with the intended process, required purity profile, physical form, solution behaviour, and compatibility with other ingredients or equipment. Buyers should evaluate documentation, local classification requirements, handling controls, and end-use restrictions before specifying material. The suitability of a particular Sodium Nitrate grade depends on the application and cannot be inferred solely from chemical identity, common name, or broad industry usage. 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.

Category
Inorganic Chemicals
Subcategory
Nitrate Salts
IUPAC name
sodium nitrate
Molecular formula
NNaO3
Molecular weight
84.995 g/mol

Uses and markets

Applications and industries

The correct product specification depends on the intended process, grade requirements and operating conditions.

Detailed product information

Detailed Sodium Nitrate product information

Composition and Nitrate-Salt Identity

Sodium Nitrate is the sodium salt of nitric acid and contains sodium and nitrate ions in an ionic crystal structure. Its formula is NNaO3, and its molecular weight is 84.995. The material is commonly associated with the names Chile saltpeter, cubic niter, soda niter, and nitrate of soda. Identity alone does not define application suitability, grade, or regulatory status.

In water, Sodium Nitrate dissociates into hydrated ions, giving it useful solubility for solution-based processing and laboratory preparation. Its nitrate content can participate in oxidation-related chemistry under suitable conditions. Process designers should account for concentration, temperature, water quality, contamination risks, and contact materials when evaluating performance in a particular system.

Industrial Context and Application Boundaries

Industrial users may consider Sodium Nitrate for analytical standards, chemical processing, glass and ceramic operations, research, and selected thermal or materials workflows. These contexts rely on different quality expectations and process controls. A material appropriate for an industrial reaction may not be appropriate for food, pharmaceutical, animal-feed, personal-care, or environmental-release applications without additional qualification.

Discussions of Sodium Nitrate in food preservation or other regulated formulations require careful distinction between chemical identity and authorised use. Applicable laws, limits, labelling rules, and manufacturing controls vary by jurisdiction. Customers should therefore define the intended market and process first, then assess whether the selected material and supporting documentation meet the relevant requirements.

Handling, Compatibility, and Process Planning

Sodium Nitrate should be managed as an oxidizing nitrate salt, with controls designed to prevent contamination and unintended contact with incompatible combustible or reducing materials. Good practice includes keeping the material appropriately identified, protected from avoidable moisture, and handled according to the applicable safety documentation and workplace procedures for the installation.

Process trials should examine dissolution rate, solution concentration, crystallisation tendency, heat exposure, and interactions with other ingredients or equipment. Small-scale evaluation can reveal effects that are not apparent from the formula alone. Particular attention is warranted where nitrate chemistry is combined with organics, reducing agents, acids, or elevated temperatures.

Specification and Selection Considerations

A suitable specification should reflect the intended use rather than simply the broad product name. Important questions may include required impurity limits, analytical method compatibility, physical form, moisture expectations, traceability, and the documentation needed for the destination market. These factors can materially affect process consistency, even when two materials share the same chemical identity.

For international procurement, technical teams should align the material with local classification, transport, storage, environmental, and end-use requirements. Grade suitability should be confirmed before production or regulated formulation. Sodium Nitrate can be a practical nitrate source in many established contexts, but responsible selection depends on documented requirements, controlled handling, and application-specific qualification.

Frequently asked questions

Questions about Sodium Nitrate

How does Sodium Nitrate behave when dissolved in water?

Sodium Nitrate dissolves into sodium and nitrate ions, producing an ionic aqueous solution. The resulting solution can support concentration-based processing, analytical preparation, and other operations that require a soluble nitrate salt. Dissolution behaviour depends on temperature, water quality, particle characteristics, agitation, and the target concentration. Concentrated solutions may crystallise if conditions change during cooling or evaporation. Users should consider the full process cycle rather than only initial solubility. The presence of nitrate also means that compatibility with reducing materials, combustible contamination, and reactive ingredients must be assessed separately from simple water dissolution.

Is Sodium Nitrate the same substance as Sodium Nitrite?

No. Sodium Nitrate and Sodium Nitrite are different salts containing different nitrogen-oxygen anions. Sodium Nitrate contains nitrate, while Sodium Nitrite contains nitrite, so their chemical behaviour, oxidation state, reaction pathways, and regulatory treatment can differ. They should not be substituted solely because their names appear similar or because both may be discussed in preservation or industrial chemistry. A formulation, analytical method, or process specification calling for one should be checked before considering the other. Identity, concentration, grade, legal status, and intended function all need separate evaluation. The final decision should be based on the supplied specification, intended process and applicable requirements rather than the chemical name alone.

What applications commonly use Sodium Nitrate?

Sodium Nitrate is used in selected chemical processing, analytical and quality-control work, research, and materials-related operations such as some glass, ceramic, and enamel processes. Its soluble nitrate chemistry can be useful where a controlled inorganic nitrate source is required. Other uses may exist in thermal, agricultural, or regulated formulation settings, but suitability depends strongly on grade, local rules, and process design. A broad catalogue description should not be treated as approval for a specific end use. Technical teams should define the reaction, concentration, impurities, operating conditions, and documentation requirements before selecting material.

What compatibility issues should be considered with Sodium Nitrate?

Sodium Nitrate should be evaluated as an oxidizing nitrate salt when compatibility is reviewed. Contact with combustible materials, reducing agents, reactive organics, or other incompatible substances may create hazards, particularly under heat, contamination, or confinement. Acids, elevated temperatures, moisture changes, and process residues can also alter system behaviour. Compatibility depends on concentration and operating conditions, not merely on a list of ingredients. Facilities should use suitable risk assessments, segregation practices, equipment reviews, and current safety documentation. Small controlled trials may help identify precipitation, corrosion, or reaction issues before scale-up. The final decision should be based on the supplied specification, intended process and applicable requirements rather than the chemical name alone.

Can Sodium Nitrate be used in food or pharmaceutical formulations?

Sodium Nitrate may be discussed in connection with regulated food or pharmaceutical contexts, but chemical identity does not establish permission for use. Eligibility depends on jurisdiction, function, concentration, purity, manufacturing controls, labelling, and the specific applicable rules. An industrial or technical material should not be assumed suitable for ingestion, drug manufacture, or any other regulated formulation. Organisations considering such use should obtain the relevant regulatory and quality assessment for the destination market and verify that the selected material is manufactured and documented for that purpose. Alternative salts must not be treated as interchangeable without formal evaluation.

What factors affect the selection of a Sodium Nitrate grade?

Selection should reflect the complete application, including required purity, impurity profile, physical form, moisture expectations, dissolution behaviour, analytical method, and process temperature. Documentation and traceability may be especially important for laboratory, regulated, or export-facing operations. Users should also review compatibility with equipment, other ingredients, storage conditions, and local classification requirements. The same chemical identity can appear in materials intended for different technical contexts, so a general-purpose description is not enough to establish suitability. Qualification should include representative testing and confirmation that the material meets the process and destination-market requirements. The final decision should be based on the supplied specification, intended process and applicable requirements rather than the chemical name alone.

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