Potassium hydrogen iodate

When heated with potassium iodate, potassium hydrogen iodate is formed HIO3 + KIO3 KH(IOs)2... 

Potassium iodate (KI03), potassium hydrogen iodate (KHI03), potassium dichromate (K2Cr207), and potassium ferricyanide (K3Fe(CN)6) are some of the primary standards commonly used to standardize sodium thiosulfate titrant. 

Preparation and standardization of sodium thiosulfate/phenylarsine oxide solution 0.025 M dissolve 6.205 g sodium thiosulfate (Na C 5 H20) or 4.200 g phenylarsine oxide (C6H5 As = 0) [PAO] in distilled water. Add 0.5 g NaOH solid and dilute to 1 L. Standardize against potassium bi-iodate (potassium hydrogen iodate) solution as described below. 

Potassium hydrogen iodate, KH(I03)2, is an excellent primary standard with a high molecular mass pier mole of protons. It is also a strong acid that can be titrated using virtually any indicator with a transition range between a pH of 4 and 10. 

Other primary standards for sodium thiosulfate are potassium dichromate, potassium bromate, potassium hydrogen iodate, potassium hexacyanoferrate(III), and metallic copper. All these compounds liberate stoichiometric amounts of iodine when treated with excess potassium iodide. 

The ability of the solid chlorates(V) to provide oxygen led to their use in matches and fireworks. Bromates(V) and iodates(V) are used in quantitative volumetric analysis. Potassium hydrogen diiodate(V), KHflOjlj, is used to standardise solutions of sodium thiosulphate(Vf) since in the presence of excess potassium iodide and acid, the reaction... 

Potassium hydrogen phthalate Potassium hydrogen phthalate Potassium iodate Anhydrous sodium carbonate Zinc metal Standardisation of sodium hydroxide solution Standardisation of acetous perchloric acid Standardisation of sodium thiosulphate solution through generation of iodine Standardisation of hydrochloric acid Standardisation of EDTA solution... 

To some extent the potassium iodide-iodate paper reveals the hydrogen ion concentration as well as the titration acidity. The reaction between iodide and iodate is described by the equation ... 

Ni(HC03)2, CuS, chromium(ni) iodate, potassium hydrogen phosphate... 

This solid can be prepared by the reaction of potassium hydrogen sulphate with barium iodate and discarding the precipitated barium sulphate. Its purity can be assessed by titration with a standard alkali. 

The iodate is a poison potassium iodide, however, is used in foodstuffs. Thus the iodate must be completely removed frequently by a final reduction with carbon. After re-solution in water, further purification is carried out before recrystallization. Iron, barium, carbonate, and hydrogen sulfide are used to effect precipitation of sulfates and heavy metals. 

Analytical Methods. A classical and stiU widely employed analytical method is iodimetric titration. This is suitable for determination of sodium sulfite, for example, in boiler water. Standard potassium iodate—potassium iodide solution is commonly used as the titrant with a starch or starch-substitute indicator. Sodium bisulfite occurring as an impurity in sodium sulfite can be determined by addition of hydrogen peroxide to oxidize the bisulfite to bisulfate, followed by titration with standard sodium hydroxide (279). 

Developed methods have been checked up by analysis of kitchen salt which contains potassium iodate. Preliminary oxidation of iodate in the salt to periodate was performed by hydrogen peroxide in the acidic solution. The results of analysis coincide with certificate data of iodinated kitchen salt. 

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