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What do you need to know In order to write the equilibrium constant expression for a reaction?
Wiki User
∙ 13y ago
To write the Keq for a reaction, the equilibrium concentrations of all reactants and products must be known. A specific example of this is how we define pH: the log of the equilibrium constant for any acid-base reaction. Just that simple, provided, of course, that the reaction does NOT go to 100% completion. Same principles apply to dissolution of partially soluble materials. If done correctly with consideration to chemical activity and coefficients, the so-called 'thermodynamic' equilibrium constants are obtained and are used in estimating quantities such as the entropy and enthalpy change of reaction.
The more difficult ( and interesting part ) is how do we know what those concentrations are? Mass balance equations are a good place to start along with any stoichiometric considerations...easy to stick to 1:1 electrolytes and other simple reactions.
Wiki User
∙ 13y ago
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If a reaction is at equilibrium and you add reactants what happens?
If you continuously add reactants even after the reaction has attained the equilibrium then according to Le Chatelier's principle, the reaction will again proceed in forward direction in order to neutralise the reactants and once again the attain the state of equilibrium.
What is the k in the rate law equation?
A rate constant
Why a reaction needs to take place at equilibrium?
Many chemical reactions, like combustion , go to completion and not to equilibrium. It is normally desirable to give a chemical reaction time to reach equilibrium in order you get the maximum yield of one or more products.
What is The order of reaction for which unit of rate and rate constant is same?
In a zero order overall process, the rate and rate constant will be the same. (Reaction order is an exponent, and if that exponent is "0" then the value is "1" and will cancel out.)
Why the direction of resultant vector in the triangle law of addition is reverse?
In order to bring the system to equilibrium, action and reaction cancel out. The resultant is the reaction.
What happens to the reaction rate as the reaction gets used up?
The reaction rate depends on the order of the reaction. In general (except for zero order), as the reaction progresses, the rate decreases with time.
What do you mean by specific reaction rate of a reaction?
The rate constant include all parameters ((but not concentration) affecting the rate of a chemical reaction.The expression "specific reaction rate" is used when the molar concentration of reactants is a unit.
The decomposition reaction of ammonia gas on platinum surface has a rate constant k equals 2.510-4 mol l-1s-1 what is the order of the reaction?
order is 0
How will decreasing the reactant concentration affect the reaction?
It depends on the order of the reaction. If it is zero order, decreasing the reactant concentration will have NO effect on the rate. If it is 1st or 2nd order (or more), then decreasing the concentration will DECREASE the reaction rate.
A first order reaction is found to have a rate constant t k equals .0000739 find the half life of this reaction?
Since the reaction is first-order, the half-life is constant and equals ln(2)/k, and the units of k are s-1. In this case, the half-life is ln(2)/(.0000739 s-1) = 9379.529 seconds.
What occurs when the forward and reverse reactions occur at the same rate?
If a forward and reverse reaction happen at the same rate, the result is called a dynamic equilibrium; the overall chemical composition does not change, even though reactions are constantly taking place.
How does collision theory relate to equilibrium?
Collision theory is when mollecules must collide with one another in order to cause a reaction. In a succesful collision, old bonds are broken as new bonds are formed. Equilibrium is a state in which forces cancel one another.
