Prepare Pure sample of potash alum || class12th chemistry practical #experiment @a2zpractical991

A2Z practical

26 Sept 202312:31

Summary

TLDRThe video script details an engaging chemistry experiment involving the preparation of potassium alum from potassium sulfate and aluminum sulfate. The process includes weighing, mixing, dissolving, heating, and filtering to achieve a milky solution. The experiment then focuses on the crystallization phase, where the solution is cooled to form clear crystals. The host demonstrates how to check for crystallization using a glass rod and suggests methods for drying the crystals. The final product, potassium alum, is showcased, and its properties are discussed, including its weight and color. The video encourages viewers to try the experiment and provides tips for success.

Takeaways

🔬 The video is about conducting a chemistry experiment related to class 12 chemistry, specifically an experiment involving potassium alum.
📝 The experiment number is 12, which is also the class level, indicating that the content is tailored for students of that grade.
🧪 The experiment involves preparing a solution using potassium sulfate and aluminum sulfate, which are weighed out according to specific measurements.
📦 The process includes transferring the chemicals into a 100 mL beaker and mixing them with a certain amount of water.
🌡 Heating the solution is part of the process, and the addition of dilute sulfuric acid is mentioned, which likely serves as a catalyst for the crystallization process.
💧 Filtering the mixture is a step to obtain a clear solution, which is then heated to induce crystallization.
🥄 The use of a glass rod is demonstrated for stirring and observing the formation of crystals during the experiment.
🔍 A method to check for crystallization involves dipping a glass rod into the solution and observing the formation of solid particles.
❄️ The formation of crystals is indicated by the appearance of solid particles on the glass rod, and the process is continued until a significant amount of solid forms.
📐 The video describes a technique for determining the endpoint of crystallization by observing the consistency of the weight of the crystals formed.
🧊 Washing and drying the crystals are part of the final steps to purify and obtain clear potassium alum crystals.

Q & A

What is the main experiment described in the script?
-The main experiment described in the script involves the preparation of alum crystals, specifically potassium aluminum sulfate, using potassium sulfate and aluminum sulfate as the main chemicals.
What are the two main chemicals required to prepare alum crystals in the experiment?
-The two main chemicals required are potassium sulfate and aluminum sulfate.
How much of each chemical is used in the experiment according to the script?
-The script mentions using 1 gram of potassium sulfate and 8 grams of aluminum sulfate for the preparation.
What is the purpose of dissolving the chemicals in water during the experiment?
-Dissolving the chemicals in water is to create a saturated solution that will later be used to grow alum crystals through the process of crystallization.
What is the role of sulfuric acid in the experiment?
-Sulfuric acid is added to the saturated solution to facilitate the crystallization process by providing the necessary acidic environment.
How is the solution heated after adding sulfuric acid in the script?
-The solution is heated to dissolve the chemicals and then cooled to allow the alum crystals to form.
What is the significance of using a glass rod in the experiment?
-The glass rod is used for stirring the solution to ensure even mixing of the chemicals and to check for the crystallization point by observing the formation of solid particles on the rod.
What is the method described in the script for separating the crystals from the solution?
-The method described involves filtering the solution through filter paper to separate the formed alum crystals from the liquid.
How are the crystals dried after being separated from the solution?
-The crystals are dried by spreading them out on a surface and allowing the water to evaporate naturally.
What is the final appearance of the alum crystals after the experiment?
-The final appearance of the alum crystals is described as clear, transparent, and octahedral in shape.
What is the approximate weight of the prepared alum crystals mentioned in the script?
-The script mentions that the weight of the prepared alum crystals is between 3.2 and 3.5 grams.

Outlines

00:00

🔬 Chemistry Experiment Preparation

The speaker begins by introducing a chemistry experiment for class 12 students. They mention that the experiment number is also 12, which is interesting and engaging. The experiment involves preparing potassium alum, which is a favorite topic in practical exams. The speaker guides the audience through the preparation process, explaining the need for two chemicals, potassium sulfate and aluminum sulfate. They detail the steps of weighing the chemicals, mixing them in a 100 mL beaker, and adding water. The process includes stirring, heating, and observing the formation of a milky color, indicating the formation of potassium alum. The speaker also discusses filtration and the importance of observing the experiment's progress.

05:01

📐 Observations and Crystallization Process

The speaker continues the experiment by discussing the observation of crystallization. They use a glass rod to check for the formation of solid particles, indicating the crystallization point. The process involves cooling the solution and observing the gradual formation of crystals. The speaker demonstrates how to identify when crystallization has occurred by observing the solid particles on the glass rod. They also explain the steps to naturally cool the solution to encourage crystal formation and the method of separating the mother liquor from the crystals using filter paper. The speaker emphasizes the importance of careful observation and the patience required in the crystallization process.

10:04

📉 Final Observations and Conclusion

In the final part of the script, the speaker concludes the experiment by discussing the final observations and the outcome. They mention the successful formation of potassium alum crystals and the method of drying them. The speaker also provides tips on how to weigh the crystals accurately and discusses the color and appearance of the crystals. They explain the importance of the experiment in understanding the properties of potassium alum and its practical applications. The speaker encourages the audience to support the channel and appreciates their viewership, emphasizing the value of subscribers and their engagement.

Mindmap

Keywords

💡Experiment

An experiment is a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact. In the video's context, the experiment involves preparing a substance and observing its properties and reactions. The script mentions starting an experiment related to chemistry, specifically for class 12, indicating an educational theme.

💡Potassium Alum (Potash Alum)

Potassium Alum, also known as Potassium Sulfate, is a chemical compound often used in various applications, including as a mordant in dyeing and in the preparation of certain chemicals. The script discusses preparing potassium alum, which is a key component in the described experiment, highlighting its significance in the process.

💡Aluminum Sulfate

Aluminum Sulfate is a chemical used in various industrial applications and is a key ingredient in the experiment described in the script. It is combined with Potassium Sulfate to create a reaction, demonstrating the importance of chemical combinations in the experiment's process.

💡Crystallization

Crystallization is the process of forming solid crystals from a homogeneous phase, typically from a solution. The script describes the process of observing crystallization as the experiment progresses, which is central to the demonstration of chemical reactions and the formation of new substances.

💡Filtering

Filtering is a method to separate solids from liquids in a mixture. In the script, the process of filtering is mentioned as a step to purify the solution and isolate the crystals formed during the experiment, showcasing a common technique in chemistry to obtain pure substances.

💡Sulfuric Acid

Sulfuric Acid is a strong acid used in various chemical reactions. The script refers to dilute sulfuric acid being added to the solution, which is a step in the experiment's procedure, indicating its role in facilitating the chemical process.

💡Heat

Heat is a form of energy transfer that can affect the rate of chemical reactions. The script describes heating the solution as part of the experiment, which is a common method to initiate or accelerate chemical reactions and lead to the desired outcome.

💡Glass Rod

A glass rod is a piece of laboratory equipment used for stirring solutions or aiding in the transfer of liquids. The script mentions using a glass rod to stir the solution and assist in the crystallization process, illustrating its utility in laboratory procedures.

💡Evaporation

Evaporation is the process by which a liquid turns into vapor, which can be used to concentrate solutions or to separate volatile substances from non-volatile ones. The script refers to the evaporation process as a means to concentrate the liquid and induce crystallization in the experiment.

💡Mordant

A mordant is a substance used in dyeing to fix dye to a fabric. Although the term is not explicitly used in the script, the preparation of potassium alum, which is a known mordant, suggests its relevance to the video's content, possibly in the context of demonstrating the substance's properties.

💡Observation

Observation is the act of carefully watching an experiment to gather data or identify changes. The script emphasizes the importance of observation throughout the experiment, such as monitoring the crystallization process and the color changes, which is crucial for understanding the experiment's outcome.

Highlights

Introduction to starting an experiment related to class 12 chemistry.

The experiment involves preparing potassium alum, an interesting and engaging process.

Mention of the experiment's relevance to physics and chemistry for class 12 students.

Instructions on preparing the solution with potassium sulfate and aluminum sulfate.

Explanation of the process, including weighing 1 gram of potassium sulfate and an appropriate amount of aluminum sulfate.

Demonstration of transferring chemicals into a 100 mL beaker for mixing.

Adding 20 mL of water to the salt mixture and transferring the solution.

The addition of dilute sulfuric acid to the solution and the subsequent heating.

Observation of the solution turning milky, indicating the start of the crystallization process.

Instructions on filtering the solution to obtain clear crystals.

The use of a glass rod to check for the crystallization point by observing solid particles.

Technique of naturally cooling the solution to initiate crystal formation.

Observation of the formation of solid substances and the beginning of crystal growth.

The process of separating the mother liquor from the crystals using filter paper.

Final observation of the clear and fine crystals of potassium alum formed.

Discussion on the washing and drying process of the crystals for further analysis.

Conclusion of the experiment with the successful preparation of potassium alum crystals.