A reversible reaction is a chemical reaction that results in an equilibrium mixture of reactants and products. A chemical reaction is a process that always results in the interconversion of Chemical substances The substance or substances initially involved in a chemical reaction are called In a Chemical process, chemical equilibrium is the state in which the chemical activities or Concentrations of the reactants and products have no net change A reagent or reactant is a substance or compound consumed during a Chemical reaction. A product is a substance that forms as a result of a Biological - or Chemical reaction. For a reaction involving two reactants and two products this can be expressed symbolically as
- aA + bB ⇌ cC + dD
A and B can react to form C and D or, in the reverse reaction, C and D can react to form A and B. This is distinct from reversible process in thermodynamics. For articles on other forms of reversibility including reversibility of microscopic dynamics see Reversibility (disambiguation. In Physics, thermodynamics (from the Greek θερμη therme meaning " Heat " and δυναμις dynamis meaning "
The concentrations of reactants and products in an equilibrium mixture are determined by the analytical concentrations of the reagents (A and B or C and D) and the equilibrium constant, K. In Chemistry, concentration is the measure of how much of a given substance there is mixed with another substance In Chemistry, concentration is the measure of how much of a given substance there is mixed with another substance For a general Chemical reaction \alpha A +\beta B. \rightleftharpoons \sigma S+\tau T. In turn the magnitude of the equilibrium constant depends on the Gibbs free energy change for the reaction. In Thermodynamics, the Gibbs free energy ( IUPAC recommended name Gibbs energy or Gibbs function) is a Thermodynamic potential which [1] So, when the free energy change is large (more than about 30 kJ mol-1), the equilibrium constant is large (log K > 3) and the concentrations of the reactants at equilibrium are very small. Such a reaction is called an irreversible reaction. See also irreversibility. In science a Process that is not reversible is called irreversible.
History
The concept of a reversible reaction was introduced by Berthollet in 1803, after he had observed the formation of sodium carbonate crystals at the edge of a salt lake. Claude Louis Berthollet ( December 9, 1748 &ndash November 6, 1822) was a Savoyard Chemist who "became vice president Sodium carbonate (also known as washing soda or soda ash), is a Sodium Salt of Carbonic acid. The salt lake or saline lake is a landlocked body of Water which has a concentration of Salts (mostly Sodium chloride) and other minerals significantly [2]
- 2NaCl + CaCO3 → Na2CO3 + CaCl2
He recognized this as the reverse of the familiar reaction
- Na2CO3 + CaCl2→ 2NaCl + CaCO3
Until then, chemical reactions were thought to always proceed in one direction. A chemical reaction is a process that always results in the interconversion of Chemical substances The substance or substances initially involved in a chemical reaction are called Berthollet reasoned that the excess of salt in the lake helped push the "reverse" reaction towards the formation of sodium carbonate. Salt is a Dietary mineral composed primarily of Sodium chloride that is essential for Animal life but toxic to most land plants Le Chatelier later extended this idea to a more general statement of the effects on equilibrium of various factors. In Chemistry, Le Chatelier's Principle, also called the Le Chatelier-Braun principle, can be used to predict the effect of a change in conditions on a Chemical
References
- ^ at constant pressure.
- ^ Chemical Equilibrium
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