Chemistry Practicals Class 11

Chemical Equilibrium

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About Simulation

  • In this simulation, you will learn about the direction of shift in the equilibrium of ions.
  • You can deepen your understanding of the law of chemical equilibrium through the provided resources. By studying the principles of dynamic equilibrium and reversible reactions, you will grasp how chemical systems reach a state where the rates of forward and reverse reactions are equal.
  • You can understand the significance of the equilibrium constant, denoted as K. By examining equations and examples; you will learn how equilibrium constants express the extent of a chemical reaction at equilibrium and provide insights into reaction conditions.
  • Through the provided resources, you will understand the change in colour intensity of prepared solutions in chemical equilibrium.

Chemistry Practical Class

  • By observing virtual demonstrations and experiments, you can explore how changes in concentration, temperature, and pressure influence the colour of solutions at equilibrium, deepening your comprehension of equilibrium phenomena.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Languages – Odia & English
Platforms – Android & Windows


The concept of chemical equilibrium arises from the realization that many reactions are reversible, meaning they can proceed in both the forward and reverse directions. When the rates of the forward and reverse reactions become equal, a state of dynamic equilibrium is established. At this point, the concentrations of the reactants and products remain constant, although the individual molecules continue to interconvert.

According to Le Chatelier’s principle, a system at equilibrium responds to changes in its conditions by attempting to counteract the disturbance and restore the equilibrium. One such change that can be introduced is altering the concentration of the reactants or products. By selectively increasing the concentration of a specific ion involved in the reaction, we can investigate the subsequent equilibrium shift and its impact on the reaction.

Chemical equilibrium is the state of a system in which temperature, pressure, volume, and composition are constant over time. Chemical reactions are classified into two types:

1. Irreversible reactions: The reaction which proceeds to completion and the products fail to recombine to give back reactants. For example

2. Reversible reactions: The reactions never go to completion, and products recombine to give back reactants. For example
Every reversible reaction comprises one pair of forward and backward reactions. When forward and backward reactions occur simultaneously, at the same rate during reversible reactions, the reaction is said to be in equilibrium.

Law of chemical equilibrium
The law states that the rate of an elementary reaction is proportional to the product of the concentration of the reactants. At a constant temperature, the rate of a chemical reaction is directly proportional to the product of the molar concentration of the reactants; each is raised to a power equal to the corresponding stoichiometric coefficients as represented by the balanced chemical equation. Let us consider the reaction,

rb=Kb [C][D]
At equilibrium rf=rb
Kf [A][B]=Kb[C][D]

Chemistry Practical Class

Kc is called the equilibrium constant, [A],[B],[C], and [D] → denotes active masses of reactants A, B, C and D, respectively.

For the general reversible reaction


Chemistry Practical Class

Watch this video to learn more about chemistry.

Requirements for this Science Experiment

  • Ferric chloride
  • Potassium ferrocyanide
  • Distilled water
  • Acetone
  • Conc. Hydrochloric acid
  • Cobalt chloride
  • Conical flask
  • Beakers
  • Boiling tubes
  • Measuring cylinders
  • Test tube stand
  • Glass rod
  • Burettes
  • Burette stands

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