Product Identification

Product Name

Sodium dihydrogen orthophosphate

Synonyms

Monosodium dihydrogen phosphate dihydrate
Monosodium phosphate dihydrate
Phosphoric acid, monosodium salt, dihydrate

CAS

13472-35-0

Formula

H6NaO6P

Molecular Weight

156

EINECS

231-449-2

RTECS

WA1900500

RTECS Class

Drug

Merck

12,8806

Beilstein/Gmelin

45388 (G)

Physical and Chemical Properties

Appearance

Colorless orthorhombic crystals

Solubility in water

Very soluble

Melting Point

60

Density

1.91 g/cm3

Usage

Used as a laxative and, in combination with other sodium phosphates, as a ph buffer.

Refractive Index

1.4629

First Aid Measures

Ingestion

Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Handling

Use with adequate ventilation. Minimize dust generation and accumulation. Avoid prolonged or repeated contact with skin. Avoid contact with eyes. Avoid ingestion and inhalation.

Hazards Identification

Ingestion

Ingestion of large amounts may cause gastrointestinal irritation.

Inhalation

May cause respiratory tract irritation.

Skin

May cause skin irritation.

Eyes

May cause eye irritation.

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: For small fires, use water spray, dry chemical, carbon dioxide or chemical foam.

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Incompatibilities

None reported with common materials.

Stability

Stable under normal temperatures and pressures.

Decomposition

Carbon monoxide, oxides of phosphorus, carbon dioxide, sodium oxide.