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Photographic fixing agent. An emulsion of sodium thiosulfate (called hypo by photographers) is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
S2O32- + AgBr(s) AgS2O3- + Br-
S2O32- + AgS2O3- Ag(S2O3)23-
- Thiosulfate is also an antidote for cyanide poisoning. It reacts with cyanide to produce sulfite and thiocyanate ions:
CN- + S2O32- SCN- + SO32-This reaction is catalyzed by an enzyme produced by cell mitochondria to neutralize small quantities of ingested cyanide (which occurs naturally in cassava root, lima beans, and almonds!).
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∙ 14y ago
Yes, sodium thiosulfate is commonly used in Photography as a fixing agent to remove unexposed silver halide crystals from photographic film and paper, stabilizing the image.
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Is sodium thiosulphate an acid or a base?
Sodium thiosulfate is neither an acid nor a base; it is a salt composed of sodium cations and thiosulfate anions. It is often used in photography as a fixing agent to dissolve unexposed silver halide in film or prints.
What is the difference between sodium sulphate and sodium thiosulphate?
Sodium sulfate (Na2SO4) is a white crystalline compound used in detergents, paper, and glass manufacturing. Sodium thiosulfate (Na2S2O3) is a colorless crystalline compound used in photography as a fixing agent and in medical treatments for cyanide poisoning. The key difference lies in their chemical structures and applications.
Is sodium thiosulphate a reactant?
Yes, sodium thiosulfate can be a reactant in chemical reactions, such as in photography as a fixing agent or in medical treatments for cyanide poisoning. It can also be used in measuring the concentration of other substances through titration reactions.
What color is Sodium Thiosulphate?
Sodium thiosulphate is typically white in color, appearing as a crystalline powder or solid.
Why is sodium thiosulphate used in iodometric titration?
Sodium thiosulfate is used in iodometric titration as a titrant to react with excess iodine after it has reacted with the analyte. This reaction helps determine the amount of iodine that reacted with the analyte, enabling the quantification of the analyte's concentration. Sodium thiosulfate is preferred due to its ability to efficiently reduce iodine to iodide ions in a one-to-one stoichiometry.
Is sodium thiosulphate an acid or a base?
Sodium thiosulfate is neither an acid nor a base; it is a salt composed of sodium cations and thiosulfate anions. It is often used in photography as a fixing agent to dissolve unexposed silver halide in film or prints.
Why sodium thiosulphate is called hypo?
Sodium thiosulfate is called hypo because it was historically used as a photographic fixer, which removed unexposed silver halide from photographic film. The term "hypo" is short for "hypo-sulfite," indicating its chemical composition.
What is the difference between sodium sulphate and sodium thiosulphate?
Sodium sulfate (Na2SO4) is a white crystalline compound used in detergents, paper, and glass manufacturing. Sodium thiosulfate (Na2S2O3) is a colorless crystalline compound used in photography as a fixing agent and in medical treatments for cyanide poisoning. The key difference lies in their chemical structures and applications.
Indicator used during the standardization of sodium thiosulphate?
Starch
Is sodium thiosulphate a reactant?
Yes, sodium thiosulfate can be a reactant in chemical reactions, such as in photography as a fixing agent or in medical treatments for cyanide poisoning. It can also be used in measuring the concentration of other substances through titration reactions.
Why is hypo used in photography?
Hypo, or sodium thiosulfate, is used in photography to fix or stabilize the image on photographic paper by removing any unexposed silver halide. This process helps to make the image permanent and prevent further exposure to light from affecting the final print.
Why sodium carbonate is used in preparation of thiosulphate solution?
Sodium carbonate is used in the preparation of thiosulfate solution to help maintain a stable pH level during the reaction. It acts as a buffer to prevent large fluctuations in pH that could affect the reaction rate or yield of the thiosulfate solution. Additionally, sodium carbonate helps to dissolve the thiosulfate salt more effectively in water during the preparation process.
What is the use of Sodium thiosulphate in iodometry?
Sodium thiosulfate is used in iodometry to titrate iodine, which allows for the determination of the concentration of substances that react with iodine. It serves as a reducing agent that reacts with iodine to form iodide ions in a redox reaction. This reaction is commonly used in analytical chemistry to quantify the amount of oxidizing agents present in a solution.
What color is Sodium Thiosulphate?
Sodium thiosulphate is typically white in color, appearing as a crystalline powder or solid.
Why is sodium thiosulphate used in iodometric titration?
Sodium thiosulfate is used in iodometric titration as a titrant to react with excess iodine after it has reacted with the analyte. This reaction helps determine the amount of iodine that reacted with the analyte, enabling the quantification of the analyte's concentration. Sodium thiosulfate is preferred due to its ability to efficiently reduce iodine to iodide ions in a one-to-one stoichiometry.
Which of the following is used as food preservative 1 sodium Benzoate 2 sodium Thiosulphate 3 sodium Hydroxide 4 sodium Bicarbonate?
1.sodium benzoate
What is sodium thiosulphate capable of?
Sodium thiosulfate is used against cyanide poisoning and pitiryazis.For nonmedical uses see this link.
