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Author Topic: Percentage ABV of alcohol mixed with sweets?  (Read 1926 times)

Offline kyleglanville

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Percentage ABV of alcohol mixed with sweets?
« on: 09/09/2012 22:26:40 »
Hi,

A slightly different type of question I would assume!

If I mix 500ml of 37.5% vol vodka (which I believe weighs 1220g) with 200g of pick n mix sweets so that all of the sweets dissolved completely into the vodka, what would the new alcoholic content of the vodka be?

In my head I have it that:

1220g of vodka (@ 37.5% vol)
+
200g of sweets (@ 0%vol)
=
1420g of mixed vodka and sweets

Therefore: 1220 / 1420 = 0.859 (3 s.f.)
0.859 * 37.5 = 32.2 (3 s.f.)

New concentration of mixed vodka and sweets = 32.2% vol (3 s.f.)

Is this correct please? Thank you!


 

Offline damocles

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Re: Percentage ABV of alcohol mixed with sweets?
« Reply #1 on: 10/09/2012 06:28:16 »
from kyleglanville:
Quote
If I mix 500ml of 37.5% vol vodka (which I believe weighs 1220g) with 200g of pick n mix sweets so that all of the sweets dissolved completely into the vodka, what would the new alcoholic content of the vodka be?

First of all, you really need to revise your beliefs about vodka. I think 1220g would cover the weight of the bottle and the weight of the coins you had to take from your piggybank to pay for it as well!

500 mL of vodka weighs roughly 460 g. I do not know exactly.

The way you need to go about your problem is as follows:
First, obtain a mass composition to replace your volume% composition of vodka. It is probably best to find tables to make this conversion, because there is some "shrinkage" in water/ethanol mixtures. Otherwise, in a na´ve sort of reckoning, 500 mL of 37.5% vodka would be a mixture of 187.5 mL ethanol and 312.5 mL water, which would mean 0.79 * 187.5 = 148 g ethanol and 312 g water.

Now, when you add your 200 g of sweets, the total mass will be 660 g

The mass composition will be 148/660 * 100% = 22.4% by mass

For the volume composition you will need to accurately measure the total volume of your sticky syrupy brew (good luck with that). I think it will probably come to somewhere around 580 mL but it might be anywhere between about 550 and 700 mL. Supposing that it is 580 mL, then the volume % will be

187.5/580 * 100% = 32.3% by volume.

Of course, during your various manipulations you are going to lose material, mainly alcohol, through evaporation, and so any figure you obtain in this sort of way only represents an upper limit. It will probably not be more than about 1% too high.

 

Offline kyleglanville

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Re: Percentage ABV of alcohol mixed with sweets?
« Reply #2 on: 10/09/2012 13:02:52 »
Thanks for the reply. (I think I may have been trying to use values for a litre of pure ethanol rather than 500ml vodka when it came to the weight? oops).

So all in all- it hasn't really come out overly different from the original vol I had before somehow!
 

Offline damocles

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Re: Percentage ABV of alcohol mixed with sweets?
« Reply #3 on: 10/09/2012 13:09:36 »
Thanks for the reply. (I think I may have been trying to use values for a litre of pure ethanol rather than 500ml vodka when it came to the weight? oops).

So all in all- it hasn't really come out overly different from the original vol I had before somehow!

Doesn't sound a lot, but 32.3%, or whatever you get when you plug in proper figures instead of my notional ones, is about 15% lower than your original 37.5%.
 

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Re: Percentage ABV of alcohol mixed with sweets?
« Reply #3 on: 10/09/2012 13:09:36 »

 

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