Salt water itself can conduct electricity. After salt is added to water, the boiling point of water will rise and it will not boil at 100℃. That is, salt is still distributed in the solution in ionic state and can conduct electricity.

Salt NaCl is an ionic crystal, which can conduct electricity only when it is in molten and solution state. However, the ions in solid NaCl are closely bound together by ionic bonds, so they have no free charge and cannot conduct electricity.

Pure water is a very weak electrolyte, and the ion concentration in pure water is very small at room temperature, so it is almost non-conductive. When NaCl is dissolved in water, a large number of Na+ and Cl- are produced. When the electrode is inserted into the solution, Na+ and Cl- move on the negative electrode and the positive electrode respectively under the action of static electricity, thus forming a current.

Extended data:

In industry, NaOH, Cl2 and H2 are prepared by electrolyzing saturated NaCl solution, and a series of chemical products are produced from them, which is called chlor-alkali industry. Chlor-alkali industry is one of the most basic chemical industries, and its products are widely used in light industry, textile industry, metallurgical industry, petrochemical industry and public utilities.

Actual production: electrolytic saturated salt solution (-) (+)? Cathode (Fe)? Anode (C) NaCl = = = Na++Cl- H2O = = H++OH- Anode: Cl-,OH-Cathode: Na+,H+Discharge capacity: Cl->; OH-; H+> Na+ anode: 2Cl- -2e === Cl2 (oxidation reaction) cathode: 2H++2e == H2 (reduction reaction) phenomenon: gas is generated at both poles, and the anode gas has a pungent smell, which can make the potassium iodide test paper of starch blue, and phenolphthalein is dripped at both poles, and it is found that phenolphthalein in the cathode area turns red. ?

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