Product Identification

Product Name

Sodium dihydrogenorthophosphate

Synonyms

Acid sodium phosphate
Monobasic sodium phosphate
Monosodium dihydrogen orthophosphate
Monosodium dihydrogen phosphate
Monosodium hydrogen phosphate
Monosodium orthophosphate

CAS

7558-80-7

Formula

H2NaO4P

Molecular Weight

119.98

EINECS

231-449-2

RTECS

WA1900000

RTECS Class

Primary Irritant

Merck

12,8806

Beilstein/Gmelin

12533 (G)

Physical and Chemical Properties

Appearance

White, odorless, granular solid or crystalline powder, slightly hygroscopic.

Solubility in water

487 g/L @ 25 C

Density

0.9996 g/cm3 (24.75 - 24.95 C)

pKa/pKb

(1) 2.15, (2) 6.82, (3) 12.38 (at 25℃) (pKa)

Usage

Ph adjustment, fungicide, herbicide, microbiocide.

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

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

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. 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

Causes respiratory tract irritation.

Skin

Causes skin irritation.

Eyes

Causes eye irritation.

Hazards

Behavior in fire: May melt with loss of steam.

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.

Poison Class

5

Fire Fighting Measures

Fire Fighting

Extinguish using media most apropriate for surrounding fire. Wear a self-contained breathing apparatus with a full facepiece operated in the positive pressure demand mode with appropriate turn-out gear and chemical resistant personal protective equipment.

Fire Potential

Nonflammable sodium dihydrogen phosphate monohydrate

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

Disposal Code

14

Incompatibilities

None reported with common materials.

Stability

Stable under normal shipping and handling conditions.

Decomposition

Carbon monoxide, oxides of phosphorus, irritating and toxic fumes and gases, carbon dioxide.

Transport Information

HS Code

2835 22 00