Dureté de l'eau   

Dureté de l'eau



Conversion of Water Hardness and calculation of the demand of Sodiumchloride for dehardening:
  1. Enter a hardness value of your choice.
Dissolved alkaline earth metals together with the dissociation forms of carbonic acid form the hardness in water. The main hardness formers are the cations of Calcium and Magnesium. The anions relevant for hardness formation are the carbonates of carbonic acid.

Boiler scale consists mainly of a stable crystal form of calcium carbonate (Calcite). Scale occurs when saturation limits are exceeded. Less stable crystal forms like Aragonite are also possible.

Ion exchangers remove Calcium and Magnesium cations by substituting them by two Sodium ions each from table salt. Calcium- and Magnesiumcarbonates are replaced by Sodiumcarbonates. Calcium- und Magnesiumchlorides leave the process with the effluent of the ion exchanger.
Facteur de conversion
Capacité acide KS4,3 mmol/liter
mval/liter
1
Degré de dureté de l'Allemagne °dH 2,8
Degré de dureté de l'Allemagne Clark
Degré de dureté de l'anglais
°Clark
°e
3,51
Degré de dureté français
(Suisse)
°fH 5
approximatif
Carbonate de calcium mg/l 50
Bicarbonate mg/l 61


Base du calcul

Capacité acide KS4,3   [mmol/liter]  
Degré de dureté de l'Allemagne   °dH  
Degré de Clark   °e  
Degré de dureté français   °fH  
Carbonate de calcium CaCO3   [mg/liter]  
Bicarbonate HCO3   [mg/liter]  





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