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AMONG Ca3(PO)2 AND Na6P6O18 WHICH HAVE ELEMENTS USED IN WATER SOFTENING
Asked by subhasanth | 11 Apr, 2020, 10:23: AM
answered-by-expert Expert Answer
Na6P6O18 Sodium hexametaphosphate, called as 'calgon' is added to hard water for softening.
 
The reaction is as:
 
Na6P6O18 → Na+  Na6P6O18 2-
 
M2+  + Na6P6O18 2- → [Na4MP6O18]2- + 2Na+ 
 
(M =Ca, Mg)
Answered by Varsha | 11 Apr, 2020, 03:13: PM
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