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Sodium Thiosulphate Pentahydrate
Original price was: $225.00.$180.00Current price is: $180.00.
Sodium thiosulfate (Na2S2O3) is an inorganic compound that is commonly used as a photographic fixer, as well as in medical and industrial applications. It is a white crystalline powder that is soluble in water and has a mild odor. In photography, sodium thiosulfate is used to remove unexposed silver halide from photographic prints and negatives, making the image permanent. In medicine, it is used as an antidote for cyanide poisoning, and in industrial applications, it is used as a reducing agent, a dechlorinating agent, and in water treatment processes.
Uses of Sodium Thiosulphate Pentahydrate
Titration Agent:
It is commonly used in iodometric titrations to determine the concentration of certain substances, particularly for quantifying iodine and chlorine.
Chemical Analysis:
It serves as a reagent for various analytical procedures, including the analysis of metal ions and the determination of dissolved oxygen in water samples.
Photographic Processing:
It is used as a fixer to dissolve unreacted silver halides from photographic film or paper, ensuring the stability and durability of the developed image.
Gold Extraction:
It acts as a leaching agent in the extraction of gold from ores, providing an environmentally friendly alternative to cyanide.
Starch Indicator:
In combination with starch, it helps to visualize the endpoint in iodometric titrations, turning blue-black in the presence of iodine.
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Properties
- Color: Red to purplish-red.
- Solubility: Soluble in water and ethanol.
- Staining Characteristics: Stains chromatin and cytoplasmic components, providing contrast for better visualization under a microscope.
Preparation
- Ingredients:
- Carmine dye: A natural red dye extracted from the cochineal insect.
- Acetic acid: A colorless liquid organic compound with a pungent smell.
- Procedure:
- Dissolve a specific amount of carmine powder in hot distilled water.
- Add glacial acetic acid to the solution.
- Filter the mixture to remove any undissolved particles.
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Physical Properties:
- Appearance: Colorless, transparent crystals or white powder.
- Solubility: Soluble in water but insoluble in alcohol.
- Melting Point: Decomposes at high temperatures before melting.
Chemical Properties:
- Molecular Formula: KAl(SO₄)₂·12H₂O
- Molecular Weight: 474.39 g/mol (for the dodecahydrate form)
- Acidity: It is slightly acidic in aqueous solution.
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