In the reaction CaO(s) + SO2(g) ---> CaSO3(s)

(Hint: try drawing the Lewis structures of SO2 and SO32-)

a. ) Ca2+ acts as a Lewis base, and SO32- acts as a Lewis acid.
b. ) SO32- acts as a Lewis base, and SO2 acts as a Lewis acid.
c. ) O2- acts as a Lewis base, and SO2 acts as a Lewis acid.
d. ) SO2 acts as a Lewis base, and O2- acts as a Lewis acid.
e. ) SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid.

In the reaction CaO(s) + SO2(g) ---> CaSO3(s)

(Hint: try drawing the Lewis structures of SO2 and SO32-)

a. ) Ca2+ acts as a Lewis base, and SO32- acts as a Lewis acid.
b. ) SO32- acts as a Lewis base, and SO2 acts as a Lewis acid.
c. ) O2- acts as a Lewis base, and SO2 acts as a Lewis acid.
d. ) SO2 acts as a Lewis base, and O2- acts as a Lewis acid.
e. ) SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid.

;kmekrrmfmkekpv

To determine the Lewis base and Lewis acid in the reaction CaO(s) + SO2(g) → CaSO3(s), we need to examine the Lewis structures of SO2 and SO32-.

The Lewis structure of SO2:

Sulfur (S) has 6 valence electrons, and Oxygen (O) has 6 valence electrons each. There are 2 Oxygen atoms in SO2.

Connecting all the atoms using single bonds gives:

O=S=O

To complete the octet of each atom, we place lone pairs of electrons around the oxygen atoms as follows:

O=S=O
:

Now, let's examine the Lewis structure of SO32-:

Sulfur (S) has 6 valence electrons, and Oxygen (O) has 6 valence electrons each. There are 3 Oxygen atoms in SO32-.

Connecting all the atoms using bonds gives:

O-S-O

To complete the octet of each atom, we place lone pairs of electrons around the oxygen atoms as follows:

O=S=O
:

Based on the Lewis structures, we can identify that the oxygen atom in SO32- (SO32- → O=S=O) has an unshared pair of electrons. Therefore, it can act as the Lewis base, donating its lone pair of electrons to another atom or ion.

On the other hand, in the reaction CaO(s) + SO2(g) → CaSO3(s), the calcium ion (Ca2+) from CaO does not have any available lone pairs of electrons. It cannot act as a Lewis base.

So, the correct answer is:

b) SO32- acts as a Lewis base, and SO2 acts as a Lewis acid.

To determine which species act as Lewis base and Lewis acid in the given reaction, we need to understand the concept of Lewis acids and bases.

Lewis acids are species that can accept a pair of electrons, while Lewis bases are species that can donate a pair of electrons.

To draw the Lewis structures of SO2 and SO32-, let's consider the valence electrons first.

Sulfur (S) has six valence electrons, while oxygen (O) has six valence electrons. Since there are two oxygen atoms, the total number of valence electrons in SO2 is 18 (6 from sulfur and 12 from oxygen).

In the case of SO32-, we need to consider the three oxygen atoms and add an extra electron since the overall charge of SO32- is -2. So, the total number of valence electrons in SO32- is 26 (6 from sulfur, 18 from three oxygen atoms, and an extra electron).

To draw the Lewis structure of SO2:
1. Place the sulfur atom in the center and connect the two oxygen atoms to it using strong bonds.
2. Each oxygen atom should have a lone pair of electrons.
3. The remaining two electrons on sulfur will form a lone pair.

To draw the Lewis structure of SO32-:
1. Place the sulfur atom in the center and connect the three oxygen atoms to it using strong bonds.
2. The sulfur atom should have two lone pairs of electrons.
3. Each oxygen atom should have a lone pair of electrons.
4. The extra electron will be localized on the sulfur atom.

Now that we have the Lewis structures of SO2 and SO32-, we can determine the Lewis acids and bases in the given reaction.

In the reaction CaO(s) + SO2(g) ---> CaSO3(s), we can see that SO2 donates a pair of electrons from its lone pairs to the calcium ion (Ca2+). This indicates that SO2 acts as a Lewis base because it donates an electron pair.

On the other hand, Ca2+ accepts the electron pair from SO2, indicating that Ca2+ acts as a Lewis acid because it accepts an electron pair.

Therefore, the correct answer is:
e) SO2 acts as a Lewis base, and Ca2+ acts as a Lewis acid.