Sodium dihydrogen pyrophosphate

  • Sodium acid pyrophosphate
Formula
Na2H2P2O7
Structure
Description
White odorless powder
Uses
Electroplating, metal cleaning and phosphatising, drilling muds, baking powders and leavening agent, buffer, sequestrant, peptising agent in cheese and meat products, frozen desserts.

Registry Numbers and Inventories.
CAS
7758-16-9
EC (EINECS/ELINCS)
231-835-0
RTECS
UX6475000
RTECS class
Other
Merck
12,8713
Beilstein/Gmelin
44986 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H2Na2O7P2
Formula mass
221.94
Decomposition point, °C
220
Density
2.311 g/cm3 (25 C)
Solubility in water
120 g/L

Hazards and Protection.
Storage
Store in a cool, dry location in a tightly sealed container.
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Protection
Wear safety glasses in compliance with OSHA regulations. Wear resistant gloves such as neoprene. Wear normal work clothing covering arms and legs.
Respirators
If needed, use a NIOSH/MSHA jointly approved dust respirator.
Small spills/leaks
Small Spill - Sweep up material for disposal or recovery. Large Spill - Shovel material into containers. Thoroughly sweep area of spill to clean up any residual material.
Stability
Stable at normal temperatures and pressures.
Incompatibilities
Strong mineral acids.
Decomposition
Phosphorous compounds.

Fire.
Fire fighting
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. Extinguish fire using most appropriate media.
Combustion products
Phosphorous compounds.

Health.
Exposure effects
Signs and symptoms of exposure to this material through breathing, swallowing, and/or passage of the material through the skin may include: stomach or intestinal upset (nausea, vomiting, diarrhea)
   Ingestion
Nausea, vomiting, abdominal pain, and diarrhea are common, leading to dehydration.
   Inhalation
Hyperventilation may occur secondary to hypocalcemia.
   Skin
May cause mild skin irritation. Symptoms may include redness and burning of skin.
   Eyes
Can cause eye irritation. Symptoms include stinging, tearing, redness, and swelling of eyes.

First aid
 
   Ingestion
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.