What is Disodium Phosphate Anhydrous CAS 7558-79-4?

Disodium phosphate anhydrous is the water-free disodium salt of phosphoric acid, Na2HPO4. It is a white crystalline or granular powder used as a buffer, emulsifier, nutrient and process aid in food, pharmaceutical and industrial applications.

How does its pH compare with monosodium phosphate?

Disodium phosphate is moderately alkaline and gives a solution pH around 9, while monosodium phosphate is acidic. The two are often combined to form phosphate-buffer systems at a desired neutral pH.

Why choose the anhydrous form instead of a hydrate?

The anhydrous form provides more active phosphate per unit weight and introduces no water of crystallization. It is useful in dry blends and processes where a higher concentration or lower added water is preferred.

What are the main applications?

It is used in processed food and beverages as an emulsifying salt, pH buffer and mineral source, in pharmaceutical formulations, in water treatment, ceramics, textiles, detergents and as a laboratory buffer component.

Is this product food grade?

The standard listing is industrial grade, with food-additive grade available and customizable according to application. Food applications should be confirmed with the supplier using the appropriate specification and documentation.

Which packaging is available?

It is supplied in 25 kg PP woven bags with a PE inner liner or 25 kg kraft paper bags with a PE inner liner. Other packing can be arranged according to order volume.

What specifications should be checked before ordering?

Confirm grade, assay, water, pH of solution, chloride, sulfate, heavy metals, arsenic, fluoride and loss on drying where relevant. Request the batch analysis, technical data and safety information before purchase.

How should disodium phosphate anhydrous be stored?

Store in tightly sealed, moisture-proof packaging in a cool, dry, ventilated area away from acids and incompatible materials. The anhydrous form is hygroscopic, so avoid prolonged exposure to humid air and use dust-control measures.

Disodium Phosphate Anhydrous CAS 7558-79-4

Disodium Phosphate Anhydrous (disodium hydrogen phosphate), CAS 7558-79-4, is an inorganic phosphate salt supplied as a buffering agent, emulsifier and dispersant for food, water treatment and industrial processes. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 7558-79-4
Synonyms: DSP, Sodium phosphate dibasic, Disodium monohydrogen phosphate, Disodium hydrogen orthophosphate, Sodium hydrogen phosphate
Einecs: 231-448-7
Molecular Formula: Na₂HPO₄
Grade: Industrial grade / Food additive grade (customizable according to application)
Package: 25 kg PP woven bag with PE inner liner 25 kg Kraft paper bag with PE inner

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Product Description

Disodium Phosphate Anhydrous, CAS 7558-79-4, also known as disodium hydrogen phosphate or sodium phosphate dibasic, is the water-free disodium salt of phosphoric acid; the EC/EINECS number is 231-448-7.

Synonyms: DSP; sodium phosphate dibasic; disodium monohydrogen phosphate; disodium hydrogen orthophosphate; sodium hydrogen phosphate.

CAS: 7558-79-4.

Molecular formula: Na₂HPO₄.

Molecular weight: 141.96 g/mol.

EC number: 231-448-7.

It is a white crystalline or granular powder with high solubility in water.

Its solution is moderately alkaline with a pH around 9; the anhydrous form provides more active phosphate per unit weight.

It is hygroscopic, so avoid prolonged exposure to humid air.

It is used in processed food and beverages as an emulsifying salt, pH buffer and mineral source.

It is used in pharmaceutical formulations, water treatment, ceramics, textiles and detergents.

It is used as a laboratory buffer component and process aid.

It is often combined with monosodium phosphate to form phosphate-buffer systems at a desired neutral pH.

Confirm grade, assay, water, pH of solution, chloride, sulfate, heavy metals, arsenic, fluoride and loss on drying where relevant.

Store in tightly sealed, moisture-proof packaging in a cool, dry, ventilated area away from acids and incompatible materials.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Disodium Phosphate Anhydrous CAS 7558-79-4?

A: Disodium phosphate anhydrous is the water-free disodium salt of phosphoric acid, Na2HPO4. It is a white crystalline or granular powder used as a buffer, emulsifier, nutrient and process aid in food, pharmaceutical and industrial applications.
Q:
How does its pH compare with monosodium phosphate?

A: Disodium phosphate is moderately alkaline and gives a solution pH around 9, while monosodium phosphate is acidic. The two are often combined to form phosphate-buffer systems at a desired neutral pH.
Q:
Why choose the anhydrous form instead of a hydrate?

A: The anhydrous form provides more active phosphate per unit weight and introduces no water of crystallization. It is useful in dry blends and processes where a higher concentration or lower added water is preferred.
Q:
What are the main applications?

A: It is used in processed food and beverages as an emulsifying salt, pH buffer and mineral source, in pharmaceutical formulations, in water treatment, ceramics, textiles, detergents and as a laboratory buffer component.
Q:
Is this product food grade?

A: The standard listing is industrial grade, with food-additive grade available and customizable according to application. Food applications should be confirmed with the supplier using the appropriate specification and documentation.
Q:
Which packaging is available?

A: It is supplied in 25 kg PP woven bags with a PE inner liner or 25 kg kraft paper bags with a PE inner liner. Other packing can be arranged according to order volume.
Q:
What specifications should be checked before ordering?

A: Confirm grade, assay, water, pH of solution, chloride, sulfate, heavy metals, arsenic, fluoride and loss on drying where relevant. Request the batch analysis, technical data and safety information before purchase.
Q:
How should disodium phosphate anhydrous be stored?

A: Store in tightly sealed, moisture-proof packaging in a cool, dry, ventilated area away from acids and incompatible materials. The anhydrous form is hygroscopic, so avoid prolonged exposure to humid air and use dust-control measures.

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