What is arrhenous equation? Write its …

The Arrhenius equation is an expression that provides a relationship between the rate constant (of a chemical reaction), the absolute temperature, and the A factor (also known as the pre-exponential factor; can be visualised as the frequency of correctly oriented collisions between reactant particles). It provides insight into the dependence of reaction rates on the absolute temperature. The expression of the Arrhenius equation is:

K = Ae^-E_a/RT

Arrhenius Equation

Where,

• k denotes the rate constant of the reaction
• A denotes the pre-exponential factor which, in terms of the collision theory, is the frequency of correctly oriented collisions between the reacting species
• e is the base of the natural logarithm (Euler’s number)
• Ea denotes the activation energy of the chemical reaction (in terms of energy per mole)
• R denotes the universal gas constant
• T denotes the absolute temperature associated with the reaction (in Kelvin)

Limitation:
It fails to explain the acidic nature of substances like CO₂, SO₂,SO₃ etc which do not have hydrogen and similarly it also fails to explain the basic nature of substances like NH₃, CaO, MgO etc which do not have -OH group.
It fails to explain the acidic and basic behaviour of substances in solvents other than water such as ammonia,alcohol.etc
The theory fails to explain why strong electrolytes like nitric acid (HNO₃) are completely ionized in aqueous solution whereas weak electrolytes like acetic acid (CH₃COOH) are ionized to a small extent only.