Silver thiosulfate

Silver thiosulfate (STS, chemical formula Ag₂S₂O₃) is an inorganic chemical that can promote early flower growth and promote flower duration in a variety of plants.^[2][3]

Silver thiosulfate

Identifiers
CAS Number	23149-52-2
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL2251960
ChemSpider	8081126
ECHA InfoCard	100.041.311
EC Number	245-458-4
PubChem CID	9905473
CompTox Dashboard (EPA)	DTXSID501015534
InChI InChI=1S/2Ag.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 Key: BLZGNFOLSIAOSQ-UHFFFAOYSA-L
SMILES [O-]S(=O)(=S)[O-].[Ag+].[Ag+]
Properties
Chemical formula	Ag2O3S2
Molar mass	327.85 g·mol−1
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

An aqueous solution of silver thiosulfate can be prepared by mixing solutions of sodium thiosulfate and silver nitrate. When used for plant assays, it is prepared using excess thiosulfate, giving the [Ag(S₂O₃)₂]^3– complex ion.^[4]