26. HYDROLYSIS OF SALTS.

Hydrolysis of salts - vzaimodeytsvy salts with water, the water molecule H+ leading to accession of proton to anion of acid radical or gidroksogruppa IT - to metal cation. The salts formed by the cations corresponding to mild bases or the anions corresponding to weak acids are exposed to hydrolysis.

Salt is formed by mild base and strong acid	Salt is formed by the strong basis and weak kislotoykisloty
CuCl2=Cu2 ++ 2Cl- H2O H ++ OH- Cu2 ++ H2O CuOH ++ H + The slabodissotsiiruyemy cation of CuOH+ is formed. Wednesday in solution acid. CuCl2+H2OCuOHCl+HCl	Na2CO3=2Na ++ CO32- H2O H ++ OH- CO32-+H2O HCO3-+OH- Slabodissotsiiruyemy HCO3-anion is formed. Wednesday - alkaline. Na2CO3+H2ONaHCO3+NaOH
Salt is formed by weak acid and mild base
(NH4)S=2NH4 ++ S2- NH4 ++ H2ONH3 · H2O+H + S2-+H2OHS-+OH- Slabodissotsiirovanny HS-anion and the ammonia dissolved in water is formed.	Al2S3+6H2O=2Al(OH)3+3H2S This reaction of hydrolysis is irreversible since the deposit of Al (OH) 3 is formed and H2S hydrogen sulfide is emitted

Hydrolysis amplifies

a) when heating solution (hydrolysis usually endothermic process) b) at solution dilution by water

Movie "Hydrolysis of Salts"

 

  

 

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