Reaction of calgon with hard water containing | vedclass

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Question

(A) Calgon is the trade name for sodium hexametaphosphate,$\left(NaPO_3\right)_6$. It ionizes in water to provide a complex anion: $Na_2\left(Na_4P_6O

Vedclass · Accepted Answer

$\left[Na_2CaP_6O_{18}\right]^{2-}$

Vedclass · Answer

(A) Calgon is the trade name for sodium hexametaphosphate,$\left(NaPO_3\right)_6$. It ionizes in water to provide a complex anion: $Na_2\left(Na_4P_6O_{18}\right) \longrightarrow 2Na^{+} + \left[Na_4P_6O_{18}\right]^{2-}$ When added to hard water,the $Ca^{2+}$ ions displace the $Na^{+}$ ions from the complex anion to form a soluble complex: $Ca^{2+} + \left[Na_4P_6O_{18}\right]^{2-} \longrightarrow \left[CaNa_2P_6O_{18}\right]^{2-} + 2Na^{+}$

Reaction of calgon with hard water containing $Ca^{2+}$ ions produces:

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