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Sodium Carbonate Monohydrate (Soda Ash)

Na2CO3 / Soda Ash
CAS 5968-11-6 · Formula CH2Na2O4 · MW 124.00 g/mol

The hydrated soda-ash grade feeding glassmaking, water treatment, and alkaline process chemistry. It is used to manufacture glass, sodium salts, and soap; in textile washing, scouring, and bleaching and in water softening; and in photography and analytical chemistry as an alkalizer and acid-base standard.

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HS Code
2836.20
At a Glance
Material Family
Acids & Salts
Record Type
Pure compound
Primary Role
pH Adjustment · Cleaning / Degreasing
Applications & Use Cases
  • Glass manufacture: Soda source for glass and silicate production.
  • Water treatment: Alkalinity and hardness control in water softening.
  • Textile processing: Washing, scouring, and bleaching auxiliary.
  • pH adjustment: Alkalizing agent and analytical acid-base standard.
Physical Properties
Physical Description
Odorless solid; Colorless to white odorless powder or granules; Hygroscopic
Melting Point
851 °C
Density
2.53 @25 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2836 . 20
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.36
Internationally harmonized (WCO HS)
Subheading 2836.20
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
5968-11-6
Molecular Formula
CH2Na2O4
Molecular Weight
124.00 g/mol
IUPAC Name
disodium;carbonate;hydrate
PubChem CID
InChI Key
MQRJBSHKWOFOGF-UHFFFAOYSA-L
Synonyms & Trade Names
SODIUM CARBONATE MONOHYDRATE Sodium carbonate, monohydrate disodium;carbonate;hydrate SODIUM CARBONATE MONOHYDRATE [II] SODIUM CARBONATE MONOHYDRATE [MART.] Carbonic acid sodium salt (1:2), hydrate (1:1) SODIUM CARBONATE MONOHYDRATE [EP MONOGRAPH] SODIUM CARBONATE MONOHYDRATE (II) SODIUM CARBONATE MONOHYDRATE (MART.) SODIUM CARBONATE MONOHYDRATE (EP MONOGRAPH) Carbonic acid disodium salt, monohydrate
Full Description

Sodium carbonate monohydrate (CAS 5968-11-6), Na2CO3 H2O, is a hydrated form of soda ash. It is used to manufacture glass, sodium salts, and soap; in textile washing, scouring, and bleaching and in water softening; and in photography and analytical chemistry as an alkalizer and acid-base standard.

Frequently Asked Questions

What is sodium carbonate monohydrate used for?

Sodium carbonate monohydrate (CAS 5968-11-6, Na2CO3.H2O), a hydrated form of soda ash, is used to manufacture glass, sodium salts, and soap; in textile washing, scouring, and bleaching and in water softening; and as an alkalizing agent and acid-base standard in photography and analytical chemistry.

Is sodium carbonate the same as sodium carbonate monohydrate?

They are closely related. Sodium carbonate monohydrate (Na2CO3.H2O, CAS 5968-11-6) is the hydrated form, carrying one water molecule per formula unit, while anhydrous soda ash is Na2CO3. They differ in CAS number and molecular weight; specify the form required when ordering.

What is another name for sodium carbonate monohydrate?

It is a hydrated form of soda ash and is sometimes referred to by trade designations for monohydrate soda ash. The unambiguous identifiers are CAS 5968-11-6 and formula Na2CO3.H2O, which appear on our CoA.

Is sodium carbonate monohydrate the same as baking soda?

No. Baking soda is sodium bicarbonate (NaHCO3). Sodium carbonate monohydrate is Na2CO3.H2O (CAS 5968-11-6), a more strongly alkaline soda-ash form with a different CAS number and application set.

What is the CAS and HS code for sodium carbonate monohydrate?

It is CAS 5968-11-6, formula Na2CO3.H2O, classified under HS 2836.20 (disodium carbonate). These identifiers are documented on the CoA and customs paperwork. Request a bulk quote for packaging and lead time.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.