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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: adi on August 24, 2022, 10:32:41 AM

Title: How would I cooling down a liquid and maintaining it at a specific temp
Post by: adi on August 24, 2022, 10:32:41 AM

Hi,

I am trying to do an experiment and essentially I want to reduce the temperature of some liquid (preferably water, also no liquid nitrogen) and maintaining it at that temperature. However, the lab does not have a cooling/ice bath. Which is why I wanted to know if there was someway to do this, and have specific temperatures (10, 20 Celsius specifically) maintain for at least a couple of minutes.

Any ideas?

Thanks in advance. ???

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: Hunter2 on August 24, 2022, 10:42:31 AM

Maybe a box with peltier elements, electrically.
Ice bath can built by your self using a Aquarium Box and add water with ice.

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: adi on August 24, 2022, 11:04:56 AM

Hi, thank you for your response!

How many peltier elements would you estimate to be required for cooling a beaker with maybe 300-400ml of water?

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: Hunter2 on August 24, 2022, 11:12:07 AM

It depends on their capacity. If its big enough can be used 1. Like a heating plate use as cooling plate and cover the beaker with polystyrene.

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: adi on August 24, 2022, 11:17:20 AM

Got it.

Thank you!

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: Corribus on August 24, 2022, 12:43:47 PM

what's your tolerance for error and do you really mean just "a few minutes"? a big quantity of water takes a long time to warm up because the specific heat of water is high. so if you want a bath at 10 deg C, get yourself a big (insulated if possible) container of water and a thermometer, and cool the water to just below the desired temperature with some ice cubes. it should stay around that temperature for a few minutes. if it starts to get too warm, add another ice cube or two.  More water is better here, to increase the thermal mass. the temperature of the bath with change more slowly.

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: RisingEastStar17 on September 11, 2022, 05:23:18 AM

It really depends on the type of chemical you want to cool and for how long. For short term, I would recommend liquid nitrogen placed underneath the container of what you want to cool.

Title: Re: How would I cooling down a liquid and maintaining it at a specific temp
Post by: Borek on September 11, 2022, 11:24:33 AM

Quote from: RisingEastStar17 on September 11, 2022, 05:23:18 AM

I would recommend liquid nitrogen

OP stated "no liquid nitrogen" in the first post, you suggest liquid nitrogen. Are you just trolling?