sodium thiosulfate

Thân thiện

A student dissolves sodium thiosulfate in a beaker of water during a chemistry experiment.

Definition

1. Noun:
   • A white crystalline compound (Na₂S₂O₃) used primarily as a fixing agent in photography: Sodium thiosulfate is an inorganic chemical that dissolves unexposed silver halides from photographic film or paper, making the image permanent.
   • A chemical with applications in water treatment and medicine: It is also used to dechlorinate water and as an antidote for cyanide poisoning.

Usage Examples

• Noun:
  • The photographer immersed the print in a bath of sodium thiosulfate to fix the image.
  • Sodium thiosulfate is effective in neutralizing chlorine in swimming pools.

Advanced Usage

• "Hypo": A common historical and industrial nickname for sodium thiosulfate, especially in photographic contexts.
  • After development, the film was transferred to a hypo bath.

Variants and Related Words

• Sodium thiosulphate (noun): An alternative spelling, chiefly British English.
• Thiosulfate (noun): The anion (S₂O₃²⁻) or any salt containing it, of which sodium thiosulfate is a common example.
• Fixer (noun): In photography, a solution (often containing sodium thiosulfate) used to fix images.

Synonyms

• Sodium hyposulfite: An older name for the compound.
• Hypo: A common short form in photography.

Related Phrases

• Fixing bath: A solution containing sodium thiosulfate used in photographic processing.
  • The final step is to rinse the print thoroughly after the fixing bath.

Học thuật

Noun

1. a compound used as a fixing agent in photographic developing

Từ đồng nghĩa

• hypo
• sodium thiosulphate