Question 1

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) $$readily dissolves in water?

Accepted Answer

The dipole attraction between water molecules and $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions is strong enough to pull the ions from the lattice.

Question 2

According to the SNAPE rule, which of the following compounds is most likely to be soluble in water?

Accepted Answer

$$\mathrm{K_2SO_4}$$

Question 3

Which equation correctly represents the dissociation of sodium chloride in water?

Accepted Answer

$$\mathrm{NaCl(s) \xrightarrow{H_2O(l)} Na^+(aq) + Cl^-(aq)}$$

Question 4

Which of the following ions is always soluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 5

A student mixes $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$ solutions. What is the expected observation?

Accepted Answer

A white precipitate of $$\mathrm{AgCl}$$ forms.

Question 6

Which of the following best describes the process of dissociation in ionic compounds?

Accepted Answer

Ionic bonds in the lattice break and ions become surrounded by water molecules.

Question 7

Which compound is insoluble in water according to the solubility table?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 8

Which of the following is a correct statement about the solubility of ionic compounds in water?

Accepted Answer

If the energy required to separate the ions is greater than the energy released when they are hydrated, the compound is insoluble.

Question 9

Which of the following best explains why $$\mathrm{AgCl} is $$insoluble in water?

Accepted Answer

The energy required to break the ionic lattice of $$\mathrm{AgCl} is $$greater than the hydration energy provided by water.

Question 10

Which of the following compounds will form a precipitate when mixed with $$\mathrm{Na_2CO_3} in $$aqueous solution?

Accepted Answer

$$\mathrm{$$BaCl_2$$}$$

Question 11

Which of the following is a colored ionic solid?

Accepted Answer

$$\mathrm{$$CuCO_3$$} ($$green)

Question 12

Which of the following best describes the hydration of ions in water?

Accepted Answer

Water molecules surround the ions, stabilizing them through dipole interactions.

Question 13

Which of the following is an exception to the general solubility of chlorides in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 14

A solution contains $$\mathrm{NH_4$^+}$$ and $$\mathrm{CO_3$^{2-}}$$ ions. What can be said about the solubility of $$\mathrm{(NH_4$)_2CO_3}$$?

Accepted Answer

$$\mathrm{(NH_4$)_2CO_3} is $$soluble in water.

Question 15

Which of the following best describes the role of hydrogen bonding in the solubility of covalent compounds in water?

Accepted Answer

Covalent compounds that can form hydrogen bonds with water are generally soluble.

Question 16

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 17

Which of the following best explains why $$\mathrm{$$KNO_3$$} is $$soluble in water?

Accepted Answer

Both $$\mathrm{K^+}$$ and $$\mathrm{NO_3$^-}$$ ions are always soluble according to the SNAPE rule.

Question 18

Which of the following is a correct statement about the solubility of sulfides in water?

Accepted Answer

Most sulfides are insoluble except those of sodium, potassium, and ammonium.

Question 19

Which of the following best describes the color of $$\mathrm{I_2$} ($$iodine) in its elemental form?

Accepted Answer

Purple

Solubility of Ionic and Covalent Compounds in Water

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