I don't know of any reason or usefull purpose why anyone would wish to add Sodium Thiosulphate (Na2 S2 O3) to the water in a fish tank. I guess if you had slightly acid water the stink of rotten eggs (sulphur) may raise a laugh but it wouldn't do the fish or plants much good.
Starch
In iodometry sodium thiosulphate is used because it is standardized by potassium dichromate and it is the best and relaible way to standardized sodium thiosulphate using iodometric titration. Infact sodium thiosulphate is also standardized by iodimetry. The difference between both of them is only of iodine. In iodometry iodine gas is liberated that will further react with sodium thiosulphate but in iodimetry standard solution of iodine is used.
· In analytical chemistry, sodium thiosulphate is used for the determination of the strength of a given solution of iodine. · Sodium thiosulphate is preferred in iodometric analysis due to the fact that sodium thiosulphate is oxidized by iodine. It is also used to determine the strength of many oxidizing agents.
1.sodium benzoate
Sodium thiosulfate is used against cyanide poisoning and pitiryazis.For nonmedical uses see this link.
Dissolution of any material is faster in powdered form.
Number 1. Sodium Benzoate is the food preservative. no. 2 and 3 are not used in food at all, no. 4 is not a preservative but is used in baking powder.
One can buy used fish tanks on AquaBid. On there, you can buy or sell used fish aquariums. Many tanks on there are cheap and afforadable, but make sure you clean it.
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.
Sodium thiosulfate reacts with iodine to form sodium iodide, sodium tetrathionate, and sulfur dioxide. This reaction is often used in titrations to determine the concentration of iodine in a solution.
Starch acts as an indicator for the endpoint of the reaction between sodium thiosulphate and potassium iodate, as it forms a blue-black complex with iodine. This color change helps identify when all the iodine has been liberated from the reaction. This method is commonly used in titrations to determine the concentration of the sodium thiosulphate solution accurately.
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.