Question

Write the chemical formula of dry ice. How is it stored? Explain why it is named too?

Answer 1

Solid form of carbon dioxide is dry ice. Liquefaction of carbon dioxide is an easy task to do. Carbon dioxide shows sublimation which means its gaseous form can be converted directly into solid state without liquid state.

Complete answer:
Carbon dioxide is a colorless, odorless and heavy gas. Like all gases, on increasing pressure it dissolves much more readily in water and this technique is used in manufacture of soda and fizzy drinks. Carbon dioxide is an easily liquefied gas due to critical temperature of about 30 Celsius and due to this easy liquefaction, this can be done by taking gaseous carbon dioxide in a cylinder and subjecting it to low temperature and high pressure. When the highly compressed carbon dioxide gas is allowed to expand rapidly or when the cylinder is open, solid carbon dioxide or dry ice is formed. Thus, dry ice also has the same chemical formula as that of carbon dioxide.
It is the solid form of carbon dioxide. Solid carbon dioxide or dry ice sublimes at $- {78^o}{\text{C}}$ which means dry ice or solid carbon dioxide again converted to gaseous carbon dioxide at $- {78^o}{\text{C}}$ and since no massy liquid is produced, it is convenient means of producing low temperatures. Also, dry ice has fewer or very less storage problems since carbon dioxide can be liquefied easily so dry ice can be produced or generated as needed.
Dry ice can be used for various purposes like preserving food items, packaging purposes for ice cream or biological samples, solidify oil spills, preventing melting of ice sculptures and ice walls, providing inert atmosphere for biological activity, preventing food items to become rancid, fog machines, to freeze and remove warts, fire extinguishers, blast cleaning, etc.
It is named dry ice due to its resemblance with ice. Also, due to the no liquid stage of carbon dioxide and carbon dioxide directly changes from gaseous form to solid form or better known as sublimation.

Note:
The density of dry ice ranges from $1.4{\text{ to }}1.6{\text{ gc}}{{\text{m}}^{ - 3}}$ . It is a colorless, non flammable, non polar compound with a sour zesty color. It shows low thermal and electrical conductivity.