Re: What % ABV
I have a few questions i would like help with?
I've started the "Vin de Noix" possible 12 litre???? recipe I posted a
After 2 x 5 litre cartons of 12% ABV red wine, + 2 litre of my own 60%
ABV neutral (for the good Green Walnut
maceration), + 1 litre of water in the sugar syrup and the 2 Kg of sugar
(about another 2 litre of volume). This
will give me approximately 15 litre of "Vin de Noix" But now here are
What % ABV is that lot gonna be at?
First you need to figure the alcohol thus...
10L @ 12% = 1.2L etoh
2L @ 60% = 1.2L etoh
Total etoh volume = 2.4L : That is 2.4L in 12L
Adding sugar to alcoholic wines is known as "Dosing" (distinguished from 'Chaptalisation') (see here )
Adding 2kg sugar will increase the overall volume, but not by 2 litres, as you might expect.
It is an extremely complicated math equation (see here ) and is better found by empirical tests.
I find that 500gm sugar dissolved in 250ml hot (90°C) water, make a volume of ~530ml.
So 2kg dissolved should only add (530 - 250) x 4 = 1.120L
Therefore total mixture volume = 10 (wine) + 2 (spirit) + 1.12 (sweet) = 13.12L
Now figure the strength (abv)...
Ethanol strength of mixture = 2.4 / 13.12 x 100 = 18.29 % abv
How much more 12% ABV red wine will I need to add to dilute it down to
about 20% Abv? (I'm diluting with 12% ABV red wine not water)
None. Rather, you'll need to add more 60% spirit to increase it to 20%
This process is known as "Fortification", ala making "port".
Calculations are easily done with the "Pearson Square" method...
- The Pearson's Square can be use to calculate the volume of alcohol that needs to added to a solution (must/wine) to achieve the desired final alcoholic strength.
A B \ / X / \ C D
X = is the final desired alcohol concentration (20.0%v/v)
A = alcohol concentration (%v/v) of the must/wine to be fortified (18.29 %v/v)
C = the alcoholic strength/concentration of the fortifying spirit (60.0%v/v)
D = the difference between X and A (20.0 - 18.29 = 1.71)
B = the difference between C and X (60.0 - 20.0 = 40.0)
18.29 40.0 \ / 20.0 / \ 60.0 1.71
Then the volume ratio of the fortifying spirit to must/wine = B/D = 40.0/1.71 = 23.39 = 1/23.39
i.e. for 13.12 L of must/wine add 13.12L x 1/23.39= 0.561L
i.e. 561ml of 60%v/v fortifying spirit will need to be added to 13.12L of must/wine, (@ 18.29%v/v alc.), to finish with a fortified wine of 20%v/v alcohol.
The final volume is approx. 13.12 + 0.561 = 13.681 litres
- Note: the final volume will not be exact due to shrinkage of volume caused by changes in alcoholic concentrations, however, these can be ignored.