Crystallisation Experiment – Explained Simply for Students
Crystallisation is a process used to purify substances. It involves forming pure solid crystals from a hot, saturated solution when it cools. Imagine making sugar syrup—if you keep adding sugar and heating it, it dissolves. But when you stop heating and let the solution cool down, sugar crystals start appearing again. That’s crystallisation!
In science, this method helps us get pure substances from their impure or dissolved forms. For example, in this experiment, we purify copper sulphate—a blue chemical—by dissolving it in water, filtering it, and letting it cool. As the temperature drops, pure blue crystals start forming because the water can’t hold that much dissolved substance anymore.
Step-by-Step Process:
- Water is heated in a beaker.
- A few drops of dilute sulphuric acid are added. This step prevents unwanted chemical reactions (called hydrolysis).
- Copper sulphate powder is added slowly while the solution is stirred and heated.
- The solution becomes saturated—meaning no more powder can dissolve.
- The hot solution is filtered to remove undissolved particles.
- It’s left undisturbed to cool slowly.
- Blue crystals of copper sulphate appear as it cools.
Why Is Crystallisation Important?
- It’s used to purify salts like copper sulphate and alum.
- It’s a common laboratory technique for separating substances.
- It helps in creating pure crystals for further study or use.
What You Will Notice:
- Water turns blue after adding copper sulphate.
- Copper sulphate dissolves faster when heated.
- As the solution cools, blue crystals form at the bottom.
Summary Table:
| Event | Result |
|---|---|
| Heating the solution | Copper sulphate dissolves |
| Saturated solution cooled | Crystals start forming |
| After cooling completely | Blue crystals obtained |
Perform Crystallisation Experiment in Dencity
With the Dencity Virtual Science Lab, you can perform the Crystallisation Experiment safely and affordably from anywhere. Whether you’re using an Android phone, iPad, or desktop, Dencity lets you explore this process through realistic simulations. You can add copper sulphate, heat the beaker, filter the solution, and even watch blue crystals form—all virtually.
This experiment is from Class 10 Science, and Dencity ensures students grasp every concept clearly. No need for lab equipment, no risk of burns or chemical mishandling—just pure interactive learning.
Dencity for Teachers
Dencity supports interactive teaching like never before. With its virtual classroom tools:
- Teachers can demonstrate the experiment live.
- Assign it as homework in under 30 seconds.
- Track student progress automatically.
- Enable collaborative learning where students can interact in real time.
- Use advanced drawing tools to explain concepts during the lesson.
Dencity Works Seamlessly on Touch Panels
Schools with interactive touch panels can use Dencity to make classroom learning highly immersive. Just touch and drag to heat, stir, or observe crystal growth. It’s perfect for smart classrooms.
Contact us today for customized pricing or a free demo of Dencity for your school.
Frequently Asked Questions
- What is crystallisation?
Crystallisation is the process of forming pure crystals from a hot saturated solution as it cools. - Why is sulphuric acid added in the experiment?
To prevent hydrolysis and keep the solution stable. - What happens when the solution cools?
Blue crystals of copper sulphate start forming. - Why do we heat the solution?
Heating allows more solute to dissolve, making it a saturated solution. - Is this experiment safe to try at home?
Not really—it’s better to perform it virtually in Dencity or under supervision. - Can I perform this experiment in Dencity?
Yes! Dencity offers a virtual version of the Crystallisation Experiment. - What class does this experiment belong to?
It is part of Class 10 Science curriculum. - Can teachers assign this as homework?
Yes, teachers can assign and evaluate it through the Dencity app. - Does Dencity work on phones?
Yes, it works on Android, iOS, and desktops. - How can schools get access?
Schools can contact us for a demo and customized pricing plans.
Explore the Dencity app—your complete virtual science lab for interactive learning and virtual science experiments!
