A hydrated thiosulfate, such as sodium thiosulfate pentahydrate, appears as colorless, transparent crystals. These crystals are typically odorless and have a slightly alkaline taste. When hydrated, the thiosulfate molecules are surrounded by water molecules, giving the crystals a hydrated appearance. **

The mesomeric boundary structure of thiosulfate (S2O3^2-) involves the resonance between two major contributing structures. In one structure, the sulfur atom is double-bonded to one oxygen atom and single-bonded to the other two oxygen atoms. In the other structure, the sulfur atom is single-bonded to all three oxygen atoms. This resonance delocalizes the negative charge over the entire molecule, giving thiosulfate its unique stability. **

The Lewis structure of thiosulfate (S2O3^2-) consists of two sulfur atoms bonded to three oxygen atoms each, with one of the sulfur atoms also bonded to a central sulfur atom. The central sulfur atom has a double bond with one of the terminal sulfur atoms and a single bond with the other terminal sulfur atom. The overall charge of the ion is -2, with each oxygen atom having a formal charge of -1 and each sulfur atom having a formal charge of 0. **

In thiosulfate (S2O3^2-), the oxidation number of sulfur is +2. This is because each oxygen atom has an oxidation number of -2, and the overall charge of the thiosulfate ion is -2. Therefore, the two sulfur atoms must have an oxidation number of +2 in order to balance the charges and satisfy the rules of oxidation numbers. **

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To calculate the titration of potassium iodate and thiosulfate, you first need to determine the balanced chemical equation for the reaction between the two compounds. Then, you can use the stoichiometry of the reaction to calculate the amount of thiosulfate required to react with a known amount of potassium iodate. This can be done by using the molar ratios of the reactants in the balanced equation. Finally, you can use the volume and concentration of the thiosulfate solution to calculate the amount of potassium iodate present in the sample being titrated. **

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