Reported in EPA TSCA Inventory.

The Disodium pyrophosphate, with the CAS registry number 7758-16-9, is also known as Disodium dihydrogenpyrophosphate; Diphosphoric acid disodium salt; Disodium dihydrogen pyrophosphate. It belongs to the product categories of Inorganics.This chemical's molecular formula is Na₂H₂P₂O₇ and molecular weight is 221.94.Its EINECS number is 231-835-0. What's more,Its systematic name is Diphosphoric acid, disodium salt.It is white powder.And it is hamfull to the health,so when you use it,avoid contact with skin and eyes. The Disodium pyrophosphate poison by intravenous route. Moderately toxic by ingestion and subcutaneous routes. An irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of PO_x and Na₂O.

Physical properties about Disodium pyrophosphate are:
 (1)ACD/LogP: -3.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -7.96; (4)ACD/LogD (pH 7.4): -8.64; (5)ACD/BCF (pH 5.5): 1.00; (6)ACD/BCF (pH 7.4): 1.00; (7)#H bond acceptors: 7; (8)#H bond donors: 4; (9)#Freely Rotating Bonds: 2;

Uses of Disodium pyrophosphate:
Disodium pyrophosphate is a buffering and chelating agent, with many food and industrial uses.
Food uses: Used in canned seafood to maintain color and reduce purge during retorting. In cured meats, it speeds the conversion of sodium nitrite to NO2- by forming the HONO intermediate, and can improve water holding capacity. It also used to keep the color of the potatoes from darkening.so it is found in frozen hash browns and other potato products.
Industrial uses: In leather treatment, it can be used to remove iron stains on hides during processing.It also can be used with sulfamic acid in some dairy applications for cleaning, especially to remove soapstone. In petroleum production, it can be used as a dispersant in oil well drilling muds.

You can still convert the following datas into molecular structure:
(1)SMILES:[Na+].[Na+].[O-]P(=O)(O)OP([O-])(=O)O;
(2)Std. InChI:InChI=1S/2Na.H4O7P2/c;;1-8(2,3)7-9(4,5)6/h;;(H2,1,2,3)(H2,4,5,6)/q2*+1;/p-2;
(3)Std. InChIKey:GYQBBRRVRKFJRG-UHFFFAOYSA-L.

The toxicity data of Disodium pyrophosphate as follows: