What is the reaction between sodium and water and why?

Sodium floats on water (because the density of sodium is lower than that of water) and reacts violently to produce a colorless, odorless gas (a chemical reaction occurs to obtain hydrogen ), accompanied by a “hissing sound”. sound (the gas emits sound on the surface of the liquid).

The sodium melts into a shiny ball (the melting point of sodium is relatively low and the reaction between sodium and water releases a lot of heat), swimming on the water (the gas generated pushes the molten sodium to move). If the phenolphthalein reagent is added dropwise to the water beforehand, you can see that the water turns red (the sodium reacts with the water to form sodium hydroxide).

Detailed information:

< p>Sodium is a metal with a silvery-white cubic structure. It is soft and light and can be cut with a knife. Its density is lower than that of water, whichi is 0.97 g/cm3. Its melting point is 97.81℃. 882.9℃. The new cut surface has a silver-white luster, which turns dark gray when oxidized in air, and is corrosion resistant.

Sodium is a good conductor of heat and electricity and has good magnetic conductivity. Potassium-sodium alloy (liquid) is a thermal conductive agent in nuclear reactors. The sodium element also has good ductility and low hardness. It can be dissolved in mercury and liquid ammonia and can form a blue solution when dissolved in liquid ammonia. Hardens at -20°C.

A total of 22 sodium isotopes have been discovered, from sodium 18 to sodium 37. Among them, only sodium 23 is stable and the other isotopes are radioactive.

Baidu Encyclopedia - Sodium

The reaction phenomenon between sodium and water: Metallic sodium floats on water and melts into small boules glowing, swimming, making fizzing noises, the reagent phenolphthalein is added and the solution turns red.

Reaction principle: Since the reaction between sodium and water is very violent, a large amount of heat is released. In a high temperature environment, hydrogen comes into contact with air and burns to produce. Sparks. Sodium reacts with water to form sodium hydroxide, which is alkaline and turns the phenolphthalein reagent red.

Chemical equation for the reaction between sodium and water

1. Chemical equation: 2Na+2H2O=2NaOH+H2↑2Na+2H2O=2NaOH+H2. ↑< /p>

2. Ionic equation: 2Na+2H2O=2Na++2OH?+H2↑2Na+2H2O=2Na++2OH?+H2↑

3. and water belongs to displacement reaction, ionic reaction, redox reaction, exothermic reaction, NaNa? is the reducing agent, H2OH2O? is the reducing agent, NaOHNaOH?

Reference for the above content: Baidu Encyclopedia-Sodium Water Reaction