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Questions and Answers
A hotplate magnetic stirrer is used to separate liquids from solids.
False
A magnetic stirrer can be used to stir buffer solutions.
True
The magnetic stirrer bar is typically made of a large, heavy metal.
False
A hotplate magnetic stirrer can reach a temperature of up to 200°C.
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A rotating magnetic field is created by the magnetic stirrer bar itself.
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Magnetic stirrers are suitable for stirring viscous liquids or thick suspensions.
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There are three common types of hotplates.
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Magnetic stirrers are only used for small experiments with a stirring capacity of less than 1 liter.
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Study Notes
What is a Hotplate Magnetic Stirrer?
- A laboratory device used to stir or mix solutions by creating a rotating magnetic field.
- Can be used with liquids or solids to obtain a homogeneous liquid mixture.
Applications of Hotplate Magnetic Stirrer
- Often used in chemistry and biology laboratories.
- Used for preparing bacterial growth and buffer solutions.
- Also used for other applications.
Main Function of a Stirrer
- Agitates the liquid to speed up reactions or improve mixtures.
How the Magnetic Stirrer Works
- An external magnetic field is applied to the magnetic stirrer to mix the solution.
- The magnetic bar is immersed in the liquid, causing the stirring action.
Features of the Magnetic Stirrer
- The hot plate can reach a temperature of over 250°C (480°F) with an output of 180 watts.
- The magnetic stirrer is adjustable from 0 to up to 1400 rpm.
Magnetic Stirrer Bar
- Coated with plastic and contains a rotating magnet.
- Creates a rotating magnetic field with the help of a rotating magnet.
- Small size makes it easy to clean and sterilize.
Limitations of the Magnetic Stirrer
- Limited size makes it suitable for relatively small experiments (less than 4 liters).
- Has difficulty dealing with viscous liquids or thick suspensions.
- May require mechanical stirring for larger capacity or more viscous liquids.
Types of Hotplates
Electric Hotplate
- Uses Aluminium/ceramic/Enamel/iron surface or coils that heat up when electricity flows.
- Pros and cons attached to all types of surfaces.
- Cheap but risky, and surface remains hot for a long time.
Induction Hotplate
- Uses magnetic induction heating technique to heat the vessel.
- Costly but safe, and cools down quickly.
- Creates a magnetic field to heat the vessel.
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Description
A laboratory device that uses a rotating magnetic field to stir and mix solutions, commonly used in chemistry and biology for preparing homogeneous liquid mixtures.
