Chemistry Practicals Class 9

Crystallization of Impure Copper Sulphate

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  • Boost conceptual clarity and knowledge retention
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  • Engaging simulations with easy-to-teach instructions

About Simulation

  • Engage in a virtual setup within the crystallization experiment simulation, where you will actively observe the purification process of impure copper sulphate through crystallization, enhancing your understanding of this purification technique.
  • Within the virtual laboratory environment, you can personally add impure copper sulphate to water and manipulate temperature settings, providing you with hands-on control over the crystallization process.
  • Gain insight into the principle of the crystallization method used for purifying substances, deepening your comprehension of this fundamental chemical process.
  • Acquire knowledge about the step-by-step procedure involved in separating impurities from copper sulphate through crystallization, empowering you with practical skills in substance purification.

Chemistry Practical Class

Simulation Details

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



It is a common separation and purification technique used in chemistry to obtain a pure solid compound from a solution containing the compound in an impure form. The crystallization process relies on the differences in solubility between the desired compound and the impurities present in the solution. When the solution is cooled or evaporated, the solubility of the compound decreases, leading to the formation of crystals. The impurities, being less soluble, are excluded from the growing crystals and remain in the solution or precipitate separately.

The process of crystallization can be understood in several stages:

  1. Heating and Dissolution: Heat the impure copper sulphate solution in a container to dissolve the copper sulphate completely. This step ensures a concentrated solution.
  2. Filtration: Filter the hot solution to remove insoluble impurities or undissolved particles, obtaining a clear solution.
  3. Cooling and Crystallization: Allow the filtered solution to cool slowly. As the temperature decreases, the solubility of copper sulphate decreases. Pure copper sulphate crystals will start forming while impurities remain dissolved or separate.
  4. Collection of Crystals: Once crystallization is complete, separate the crystals using filtration or decantation. These crystals are purer compared to the initial solution.
  5. Drying: Dry the obtained crystals to remove any remaining moisture, yielding pure copper sulphate crystals.

It is important to note that the success of crystallization as a purification method depends on various factors, such as the choice of solvent, cooling rate, and the presence of suitable seed crystals.

Requirements for this Science Experiment

Crude copper sulphate Distilled water Beakers Funnel Filter paper Stand for funnel China dish Tongs Bunsen burner Tripod Stand Wire gauze

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