Class 12 Exam > Class 12 Videos > EDGE : Structure of NaCl - The Solid State, Chemistry, Class 12
EDGE : Structure of NaCl - The Solid State, Chemistry, Class 12 Video Lecture
FAQs on EDGE : Structure of NaCl - The Solid State, Chemistry, Class 12 Video Lecture
| 1. What is the structure of NaCl in its solid state? |  |
Ans. NaCl, also known as table salt, has a crystal lattice structure in its solid state. It forms a cubic crystal lattice structure known as the face-centered cubic (FCC) arrangement. In this arrangement, each sodium ion is surrounded by six chloride ions, and each chloride ion is surrounded by six sodium ions. This arrangement gives NaCl its characteristic properties such as its high melting and boiling points.
| 2. What is the significance of the structure of NaCl in its solid state? | |
Ans. The structure of NaCl in its solid state is significant because it determines its properties and behavior. The crystal lattice structure of NaCl gives it a high melting and boiling point, as well as a solid and rigid structure. This structure also allows NaCl to have a high solubility in water, as the polar water molecules can easily interact with the charged ions in the crystal lattice.
| 3. How does the structure of NaCl influence its physical properties? | |
Ans. The structure of NaCl influences its physical properties in several ways. The strong ionic bonds between the sodium and chloride ions in the crystal lattice give NaCl a high melting and boiling point. The structure also contributes to its brittleness, as the regular arrangement of ions makes it difficult for them to move past one another. Additionally, the structure allows NaCl to conduct electricity when molten or dissolved in water, as the charged ions are free to move and carry electrical charge.
| 4. How is the structure of NaCl related to its chemical properties? | |
Ans. The structure of NaCl is related to its chemical properties because it determines how the ions interact with other substances. The strong ionic bonds in the crystal lattice make it difficult for NaCl to undergo chemical reactions with other substances. However, when NaCl dissolves in water, the crystal lattice breaks apart, and the individual ions become free to participate in chemical reactions. This property of NaCl is important in various chemical processes, such as its use as a reagent in laboratory experiments or as a seasoning in food.
| 5. How does the structure of NaCl compare to other compounds with different structures? | |
Ans. The structure of NaCl, with its face-centered cubic arrangement, is just one example of the many possible crystal lattice structures that compounds can have. Other compounds may have different arrangements, such as the body-centered cubic (BCC) structure or the hexagonal close-packed (HCP) structure. These different structures result in different physical and chemical properties for each compound. For example, compounds with BCC structures may have different melting and boiling points compared to NaCl. Understanding the structure of compounds is crucial in predicting and explaining their properties and behavior.
Text Transcript from Video
let's see the structure of nacl radius
of a sodium ion is 0.95 angstrom and
that of chloride ion is 1.8 1 angstrom
the radius ratio of sodium ion and
chlorine ion comes out to be zero point
5 to 6 the radius ratio suggests that
coordination number of each ion is 6 so
in NaCl structure each any plus ion is
surrounded by 6 CL minus ions
so and similarly each cl- ion is
surrounded by six ne plus ions and as
you can see each sodium ion is
octahedrally surrounded by six chlorine
ions if we extend the cubic structure we
can also see that each chlorine ion is
octahedral II surrounded by six sodium
ions
total number of chloride ions per unit
cell is one-eighth of eight chloride
ions at the corner of the cube and half
of six chloride ions at the face centers
of the cube so total number of chloride
ions per unit cell is four
number of sodium ions per unit cell is
given by sum of one-fourth of twelve
sodium ions at the center of each side
of the cube and one sodium ion at the
body center of unit cell which equals to
four sodium ions per unit cell
of a sodium ion is 0.95 angstrom and
that of chloride ion is 1.8 1 angstrom
the radius ratio of sodium ion and
chlorine ion comes out to be zero point
5 to 6 the radius ratio suggests that
coordination number of each ion is 6 so
in NaCl structure each any plus ion is
surrounded by 6 CL minus ions
so and similarly each cl- ion is
surrounded by six ne plus ions and as
you can see each sodium ion is
octahedrally surrounded by six chlorine
ions if we extend the cubic structure we
can also see that each chlorine ion is
octahedral II surrounded by six sodium
ions
total number of chloride ions per unit
cell is one-eighth of eight chloride
ions at the corner of the cube and half
of six chloride ions at the face centers
of the cube so total number of chloride
ions per unit cell is four
number of sodium ions per unit cell is
given by sum of one-fourth of twelve
sodium ions at the center of each side
of the cube and one sodium ion at the
body center of unit cell which equals to
four sodium ions per unit cell
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Nov 24, 2024 Last updated |
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