Go Back   Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum

High School Chemistry Forum Ask your high school chemistry questions here.

Reply
 
Thread Tools Display Modes
Old Feb 12th 2018, 01:01 PM   #1
Zack
Junior Member
 
Join Date: Feb 2018
Location: England
Posts: 1
Zack is on a distinguished road
Angry Sticky Situation (Why doesn't sugar recrystallize ?)

Hello everyone My Name is Zack, I am new to chemistry but I will be starting a chemistry course in a couple of months. I have some basic books and I am doing some simple experiments.

I am now on to crystallization and dissolving large amounts of a solid and then trying to get it to precipitate out of the solution - I am told that this is a very important skill for chemists to have.

I decided to use white sugar as my solid. I started with sugar and hot water, I poured over half a litre of water into a large glass jar and then added around 250 grams of white granulated sugar. I stirred and stirred and stirred until all of the sugar dissolved in the water, I then waited several hours for the solution to cool down hoping to see a big chunk of sugar crystals and prove the precipitation theory, but nothing happened - the sugar stayed in the water and never returned to a solid state!

Can anyone explain why it did not work ?

Also can you recommend a solid that would work ?


Thank You so much for your kind help.

Zack
Zack is offline   Reply With Quote
Old Feb 12th 2018, 09:46 PM   #2
oz93666
Member
 
Join Date: May 2017
Location: thailand
Posts: 87
oz93666 is on a distinguished road
Hi Zack .... could be the water wasn't hot enough , the hotter it is ,so the more sugar will dissolve.... and it follows that more will crystallize out as it cools ...

But you also need a 'seed' crystal ,or object on which the crystals can grow ...

Youtube is a great place for information ...many videos like this
oz93666 is offline   Reply With Quote
Reply

  Chemistry Help Forum > Chemistry Forums > High School Chemistry Forum



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed