Hardness in Water (Leaving Cert Chemistry): Flashcards

Water with high dissolved $\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ ions

Scum (greyish, insoluble precipitate)

Temporary and permanent

$\text{Ca(HCO}_3)_2$ and $\text{Mg(HCO}_3)_2$

Boiling

$\text{CaSO}_4$ or $\text{MgSO}_4$

No

Ion exchange resin

Calcium carbonate ($\text{CaCO}_3$)

Fizzes, releases $\text{CO}_2$

All ions from water

Distilled water