Chemistry - Hydrogen and Its compound Question with Solution | TestHub

Calgon forms soluble complexes with the cationic species ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$, present in hard water.

${\mathrm{Na}}_2\left[{\mathrm{Na}}_4{\left({\mathrm{PO}}_3\right)}_6\right]\to 2{\mathrm{Na}}^{+}+{\left[{\mathrm{Na}}_4{\left({\mathrm{PO}}_3\right)}_6\right]}^{2-}$$2{\mathrm{M}}^{2+}+{\left[{\mathrm{Na}}_4{\left({\mathrm{PO}}_3\right)}_6\right]}^{2-}\to {\left[{\mathrm{M}}_2{\left({\mathrm{PO}}_3\right)}_6\right]}^{2-}+4{\mathrm{Na}}^{+}$