Question 5
4 pts
Some salts (for example, NaCl) are soluble in water while others (for example, Ca$_3$(PO$_4$)$_2$) are
insoluble in water. Why is Ca$_3$(PO$_4$)$_2$ insoluble in water?
1. Ions with charges larger that +1 and -1 are generally insoluble in water.
2. Larger charges on the ions means that there are more delocalized electrons making it
harder for the ions to separate from each other.
3. Strong ion-dipole interactions would form between the ions and water molecules.
4. The entropy of the solution would decrease because the water molecules would be
"locked" in place.
2 and 3
2 only
1, 3, and 4
1 and 3
1 only
