Sodium Thiosulfate

Na₂S₂O₃

IUPAC: Sodium thiosulfate

CAS: 7772-98-7

Übersicht

Sodium thiosulfate (hypo) was essential in analog photography as a photographic fixer. It also neutralizes chlorine in water.

Zusammensetzung

Element Symbol Atome Atommasse
Oxygen O 3 15,9990
Sodium Na 2 22,9900
Sulfur S 2 32,0600

Elementare Zusammensetzung

O
Oxygen ×3
30,4%
Na
Sodium ×2
29,1%
S
Sulfur ×2
40,6%

Verwendung

  • • Photography fixer
  • • Chlorine neutralizer
  • • Cyanide poisoning antidote
  • • Gold extraction

Wissenswertes

  • ✦ In photography, sodium thiosulfate removes unexposed silver halide — the process is called 'fixing' the image

Structure

SMILES

[O-]S(=O)(=S)[O-].[Na+].[Na+]

Eigenschaften

Typ
salt
Zustand
solid
Molmasse
158,11 g/mol
Dichte
1,6700 g/cm³
Schmelzpunkt
48,3 °C
Löslichkeit
700 g/L at 20°C

Molecular Descriptors

Exact Mass
157,9084
TPSA
104,0 Ų
H-Bond Donors
0
H-Bond Acceptors
4
Rotatable Bonds
0
Heavy Atoms
7
Complexity
82,0

Verwandte Verbindungen

Diammonium Phosphate

(NH₄)₂HPO₄

Ammonium Chloride

NH₄Cl

Barium Chloride

BaCl₂

Cadmium Sulfide

CdS

Calcium Sulfate

CaSO₄

Cerium(III) Chloride

CeCl₃

Copper(II) Sulfide

CuS

Ammonium Sulfate

(NH₄)₂SO₄

Ammonium Bicarbonate

NH₄HCO₃

Calcium Propionate

Ca(C₂H₅COO)₂

Frequently Asked Questions

What is Sodium Thiosulfate?
Sodium Thiosulfate (Na₂S₂O₃) is a salt compound with the IUPAC name Sodium thiosulfate.
What is the molecular weight of Sodium Thiosulfate?
Sodium Thiosulfate has a molar mass of 158.11 g/mol.
What state is Sodium Thiosulfate at room temperature?
Sodium Thiosulfate is a solid at room temperature.
Is Sodium Thiosulfate organic or inorganic?
Sodium Thiosulfate is classified as an inorganic compound.
What elements make up Sodium Thiosulfate?
Sodium Thiosulfate (Na₂S₂O₃) is composed of Oxygen (O), Sodium (Na), Sulfur (S).