Sodium thiosulfate

Sodium thiosulfate ;
Names:	sodium thiosulfate; sodium thiosulphate; hyposulfite; sodium sulfidoxytrioxosulfate; dechlorinator;
Formula:	Na2S2O3 (anhydrous); Na2S2O3 · 5H2O (pentahydrate);
Molar mass:	158.107 g/mol (anhydrous); 248.181 g/mol (pentahydrate);
Density:	2.345 g/cm3 (anhydrous); 1.715 g/cm3 (pentahydrate);
Crystal system:	monoclinic (pentahydrate); a=5.94 Å, b=21.57 Å, c=7.53 Åα=90°, β=103.96°, γ=90°;
Shapes:	https://en.crystalls.info/w/uploads/media/a/af/Tetragonal_prism.json Tetragonal prism https://en.crystalls.info/w/uploads/media/5/52/Needle.json Needle ;
Color:	colorless;
Melting point:	48.5 °C321.65 K <br />119.3 °F <br />578.97 °R <br /> (pentahydrate);
Decomposition point:	220 °C493.15 K <br />428 °F <br />887.67 °R <br /> (anhydrous); 100 °C373.15 K <br />212 °F <br />671.67 °R <br /> (pentahydrate);
Stability:	erodes (pentahydrate);
Hardness:	fragile

Description

Inorganic compound, salt of alkaline metal sodium and inorganic thiosulfuric acid. From water solutions crystallizes as pentahydrate.

Where to buy

Can be bought in pharmacy.

Solubility

TableGraph

Temperature	g/`100,00` g water	g/`100,00` g ethanol	g/`100,00` g ammonia	g/`100,00` g dimethylformamide
Temperature	(pentahydrate)	(pentahydrate)	(anhydrous)	(anhydrous)
0°C273.15 K <br />32 °F <br />491.67 °R <br />	`50.2`
10°C283.15 K <br />50 °F <br />509.67 °R <br />	`59.7`
20°C293.15 K <br />68 °F <br />527.67 °R <br />	`70.1`	`0.0034`
25°C298.15 K <br />77 °F <br />536.67 °R <br />	`75.9`		`0.17`	`0.08`
35°C308.15 K <br />95 °F <br />554.67 °R <br />	`91.2`
40°C313.15 K <br />104 °F <br />563.67 °R <br />	`104.1`
45°C318.15 K <br />113 °F <br />572.67 °R <br />	`123.9`
60°C333.15 K <br />140 °F <br />599.67 °R <br />	`191.3`
80°C353.15 K <br />176 °F <br />635.67 °R <br />	`231.8`
100°C373.15 K <br />212 °F <br />671.67 °R <br />	`245`

Gallery

Sodium thiosulfateManzana cristal, reddit.comManzana cristalReddit.com
Grown in 1.5 weeksSodium thiosulfate, Eugene Dudko, VKontakteEugene DudkoVKontakte
Grown in 1.5 weeksSodium thiosulfate, Eugene Dudko, VKontakteEugene DudkoVKontakte
Grown in 1.5 weeksSodium thiosulfate, Eugene Dudko, VKontakteEugene DudkoVKontakte
Sodium thiosulfateIlya Eltsov, VKontakteIlya EltsovVKontakte
Sodium thiosulfateIlya Eltsov, VKontakteIlya EltsovVKontakte
Sodium thiosulfateIlya Eltsov, VKontakteIlya EltsovVKontakte
Growth from hot supersaturated solution over nightSodium thiosulfate, Pleasewakeupm8, reddit.comPleasewakeupm8Reddit.com
Growth from hot supersaturated solution over nightSodium thiosulfate, Pleasewakeupm8, reddit.comPleasewakeupm8Reddit.com

Video

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Sources

Thiosulfates
Barium thiosulfate (BaSO₃S) • Sodium thiosulfate (Na₂S₂O₃)

Sodium compounds
Salts	Sodium acetate (NaCH₃COO) • Sodium bromide (NaBr) • Sodium citrate (Na₃C₃H₅O(COO)₃) • Sodium chlorate (NaClO₃) • Sodium chloride (NaCl) • Sodium cyclamate (C₆H₁₂NNaO₃S) • Sodium decavanadate (Na₆V₁₀O₂₈) • Sodium ethilate (NaC₂H₅O) • Sodium glutamate (NaC₅H₈NO₄) • Sodium hydrocarbonate (NaHCO₃) • Sodium hydrosulfate (NaHSO₄) • Sodium iodide (NaI) • Sodium metavanadate (NaVO₃) • Sodium niobate (NaNbO₃) • Sodium nitrate (NaNO₃) • Sodium oxalate (Na₂C₂O₄) • Sodium para-aminosalicylate (C₇H₆NNaO₃) • Sodium perchlorate (NaClO₄) • Sodium saccharinate (C₇H₄NaNO₃S) • Sodium sulfate (Na₂SO₄) • Sodium sulfide (Na₂S) • Sodium tetraborate (Na₂B₄O₇) • Sodium thiosulfate (Na₂S₂O₃) • Sodium trichloroacetate (NaCCl₃COO) • Sodium trioxalatoaluminate (Na₃[Al(C₂O₄)₃]) • Sodium tungstate (Na₂WO₄)
Double salts	Potassium-sodium tartrate (KNaC₄H₄O₆) • Sodium-ammonium sulfate (NaNH₄SO₄) • Uranyl-sodium acetate (NaUО2(CH₃COO)₃) • Uranyl-zinc-sodium acetate (NaZn(UO₂)₃(CH₃COO)₉) • Zinc-sodium sulfate (Na₂Zn(SO₄)₂)
Adducts	Glucose and sodium bromide adduct (2C₆H₁₂O₆ · NaBr) • Glucose and sodium chloride adduct (2C₆H₁₂O₆ · NaCl) • Urea and sodium chloride adduct (CO(NH₄)₂ · NaCl)
Complex compounds	Sodium dicarbonatocuprate(II) (Na₂[Cu(CO₃)₂]) • Sodium dioxalatocuprate(II) (Na₂[Cu(C₂O₄)₂]) • Sodium ethylenediaminetetraacetate-ferrate(III) (Na[Fe((OOCCH₂)₂N(CH₂)₂N(CH₂COO)₂)]) • Sodium hexacyanoferrate(II) (Na₄[Fe(CN)₆]) • Tripotassium-sodium hexacyanoferrate(II) (K₃Na[Fe(CN)₆]) • Sodium hexafluorosilicate (Na₂[SiF₆]) • Sodium nitroprusside (Na₂[Fe(CN)₅NO]) • Sodium trioxalatochromate(III) (Ns₃[Cr(C₂O₄)₃]) • Dipotassium-sodium trioxalatoferrate(III) (K₂Na[Fe(C₂O₄)₃]) • Potassium-sodium trioxalatoferrate(III) (K₅Na[Fe(C₂O₄)₃]₂) • Sodium trioxalatoferrate(III) (Na₃[Fe(C₂O₄)₃])

Sodium thiosulfate
Names:	sodium thiosulfate sodium thiosulphate hyposulfite sodium sulfidoxytrioxosulfate dechlorinator
Formula:	Na₂S₂O₃ (anhydrous) Na₂S₂O₃ · 5H₂O (pentahydrate)
Molar mass:	158.107 g/mol (anhydrous) 248.181 g/mol (pentahydrate)
Density:	2.345 g/cm³ (anhydrous) 1.715 g/cm³ (pentahydrate)
Crystal system:	monoclinic (pentahydrate) a=5.94 Å, b=21.57 Å, c=7.53 Åα=90°, β=103.96°, γ=90°
Shapes:	Tetragonal prism Needle
Color:	colorless
Melting point:	48.5 °C321.65 K <br />119.3 °F <br />578.97 °R <br /> (pentahydrate)
Decomposition point:	220 °C493.15 K <br />428 °F <br />887.67 °R <br /> (anhydrous) 100 °C373.15 K <br />212 °F <br />671.67 °R <br /> (pentahydrate)
Stability:	erodes (pentahydrate)
Hardness:	fragile