Dehumidifier: salt acts hygroscopic - chemical explanation

06-20  Source: Network gathering  Views:42 


Dehumidifier: salt acts hygroscopic - chemical explanation

Too much water in the air to prevent through a dehumidifier.

Salts in dehumidifiers

  • First, you should know that means a salt with a hygroscopic salt that is able to draw moisture from the environment. It usually is water from humidity.
  • Hygroscopic salts contained in the dehumidifiers which can fulfill their function. Such salts are also called a drying agent.
  • Hygroscopic salts can build water in their crystal structure and tie it.
  • A known you from everyday water astringent salt is NaCl - common salt. Will it be stored in the open, it clumped quickly. This is also the main reason why you should store your household salt in sealed cans. In Salt Shaker help, for example, a few rice grains absorb the water faster.
  • In dehumidifiers calcium chloride is often used.

Examples of hygroscopic salts

  • Two of the most commonly used drying agent in the laboratory are calcium chloride and phosphorus pentoxide. Which you use is a matter of taste generally.
  • A certain amount of CaCl 2 can bind six times as much water molecules. This is done by the chemical formula CaCl2 + 6 H 2 O -> CaCl2 * 6H 2 O. In this process, heat is generated.
  • A very efficient drying agent is P 4 O 10th The reaction with the water from the humidity proceeds in three stages. 1. P 4 O 10 + 2 H 2 O -> H 4 P 4 O 12, 2 H 4 P 4 O 12 + 2 H2O -> 2 H 4 P 2 O 7, 3 H 4 P 2 O 7 + H 2 O -> 2 H 3 PO 4.
  • Another, but dangerous to handle drying agent is Mg (ClO 4) second The reaction formula for this purpose is Mg (ClO 4) 2 + 2 H 2 O -> Mg (ClO 4) 2 * 2H 2 O.
  • Zeolites have in their crystal structure pores and / or channels in which they can take up water molecules.
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