So the answer is: no; Iodized salt contains potassium iodate instead of iodine;
(2) According to the information link in the question, we can know that salt is made into solution first. If the salt solution contains potassium iodate, iodine will be generated after adding potassium iodide solution and dilute sulfuric acid. When starch solution is added to the solution, the solution will turn blue.
Therefore, the answer is: iodized salt contains potassium iodate; Taking salt solution, adding potassium iodide solution and dilute sulfuric acid, oscillating, and adding starch solution into the solution until the solution turns blue;
(3) Because high-temperature cooking will reduce the iodine content, it shows that potassium iodate is easy to decompose when heated;
So the answer is: potassium iodate is easy to decompose when heated;
(4) According to the iodine content in the iodized salt label, if iodine 100mg is supplemented by eating the iodized salt, the quality of iodized salt that needs to be eaten at least once a day is100 mg 60 mg kg ≈1.67 kg.
So the answer is: 1.67Kg. ..