Chapter 11, Problem 48AC

To determine

From the following options, the hard water contains:

a. ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$ ions.

b. ${\text{Na}}^{+}$ and ${\text{K}}^{+}$ ions.

c. ${\text{Ca}}^{2+}$ and ${\text{Mg}}^{2+}$ ions.

d. ${\text{Ba}}^{2+}$ and ${\text{Cl}}^{-}$ ions.