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solution question

J

Jerboy

Banned
When I froze some soda, I noticed concentration isn't even through out the frozen mass and fluid that is molten first has higher concentration of sugar than the original fluid and fluid melting later is much diluted. Is is just me or does freezing and thawing throws around the concentration of a solution?
 
I'm not a chemist, but i'll try 🙂
Soda is part water too. The water freezes much earlier than the rest of the soda. When you start drinking, everything seeps through the ice and becomes that first molten part you're referring to (the tasty slushy part) when it gets to the top of the can. Most of what's left behind is just water... colored water actually, with a lot less sugar content.
 


<< I'm not a chemist, but i'll try 🙂
Soda is part water too. The water freezes much earlier than the rest of the soda. When you start drinking, everything seeps through the ice and becomes that first molten part you're referring to (the tasty slushy part) when it gets to the top of the can. Most of what's left behind is just water... colored water actually, with a lot less sugar content. >>



I thought solution was homogeneous and my understanding was anything short of reverse osmosis or distillation would separate the components where colloids and suspension is separable with centrifuge or filteration.
 
The syrup is water soluable, however when the water freezes the syrup does not freeze (at least not at the same time), this creates a solid in liquid scenario. What I have done that seems to work fairly well is to get a plastic bottle, freeze it to below freezing at room pressure but less than freezing under the bottle's pressure. Open the bottle, then watch as it slushifies. This works because the freezing process happens quickly enough that the two solutions don't have a suitable amount of time to seperate (it freezes in a few seconds) and the syrup gets effectively locked in the ice.
 
Yeah, the water freezes first then the sugar and color parts. If you partially freeze the soda and then suck out the non-frozen part you will see that the left with pieces of frozen water (ice). Usually these pieces are very flat.
 
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