October 19, 2019, 04:32:37 PM
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Topic: Hydrate Lab (AP chem)  (Read 243 times)

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Offline troyquach

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Hydrate Lab (AP chem)
« on: September 11, 2019, 01:01:50 AM »
Hey guys. I am doing lab tomorrow about an unknown hydrate and was wondering how long I should heat it as we are writing our own procedures. The hydrate is also white and will not change color unlike in Chem year 1 where we had CuSO4 which was blue and turned white. Just a starting guideline time would be great. Thanks!

Offline chenbeier

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Re: Hydrate Lab (AP chem)
« Reply #1 on: September 11, 2019, 01:07:12 AM »
Heat it för 2h, cool down then weight, Heat again 1h weight again.  Compare the values. Probably repeat and compare again until constant weight.

Offline troyquach

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Re: Hydrate Lab (AP chem)
« Reply #2 on: September 11, 2019, 02:41:48 AM »
If by 2H u mean 2 hours, that might not be applicable in my case just because our class period is 55 minutes. Thanks for the response though!

Offline Borek

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Re: Hydrate Lab (AP chem)
« Reply #3 on: September 11, 2019, 03:29:44 AM »
If by 2H u mean 2 hours, that might not be applicable in my case just because our class period is 55 minutes.

I am afraid that's not enough for any reasonable drying procedure. Actually 55 min. is way too short for most labs I can think of.

What the lab is about? Perhaps you will get dried hydrate?
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Offline Corribus

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Re: Hydrate Lab (AP chem)
« Reply #4 on: September 11, 2019, 08:35:50 AM »
Depends on sample size. When we do TGA on hydrates they can be de-hydrated in a matter of minutes under dry nitrogen... but this is with samples sizes 25-30 mg.
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