Question

Ca2+ and mg2+ ions can be precipitated by calgon to soften the hard water? True or false.

Answer 1

Answer on Question #48478 - Chemistry – Inorganic Chemistry

Question

$\mathrm{Ca^{2+}}$ and $\mathrm{Mg^{2+}}$ ions can be precipitated by calgon to soften the hard water? True or false.

Answer:

Calgon actually does not precipitate $\mathrm{Ca^{2+}}$ and $\mathrm{Mg^{2+}}$ but it converts it into a soluble complex which prevents it from causing hardness.

$$\begin{array}{l} 2 \mathrm{Ca}^{2+} + \mathrm{Na_2[Na_4(PO_3)_6]} \rightarrow \mathrm{Na_2[Ca_2(PO_3)_6]} + 4 \mathrm{Na^+} \\ 2 \mathrm{Mg}^{2+} + \mathrm{Na_2[Na_4(PO_3)_6]} \rightarrow \mathrm{Na_2[Mg_2(PO_3)_6]} + 4 \mathrm{Na^+} \\ \end{array}$$

The complexes of calcium and magnesium so formed remain dissolved in water as they are soluble.

Answer: False.

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