Allotment Gardening Advice Help Chat

Eating and Drinking => Homebrew => Topic started by: coop-de-tat on October 19, 2013, 00:06

Title: Grape juice wine sugar content.
Post by: coop-de-tat on October 19, 2013, 00:06: Simple question :=]

I'm preparing to brew some wine from ASDA's brand 100% Pure Red Grape Juice.

The sugar content of each litre is marked on the bottle as 163g (16.3g/100ml) How do I calculate how much sugar to add (or even do I add any at all)??

I want to make a 5 litre/gallon demijohn of wine.

I would like to aim at getting about 12% alcohol in the finished wine.

TIA for any help forthcoming.

CdT
Title: Re: Grape juice wine sugar content.
Post by: VegGirl7 on October 19, 2013, 11:43: Hi CdT, do you have a hydrometer?

I aim for around 12% for my wines which, according to the table in my winemaking book, needs a starting SG of 1090 - it says that this is the equivalent of 2lb 6oz (1065g) of sugar in the gallon (there's 4546ml in the gallon)

My maths is not the greatest!! but by my simple calculations 16.3g/100ml is the equivalent of 740.998g/gallon so you need to add 324g sugar / gallon to increase the SG to 1090...

I think that's right :unsure:

When adding sugar I do it slowly and keep checking the SG as I go to make sure I haven't made crazy mistakes in my calculations and to be 100% sure on my starting SG so I can work out the ABV% at the end
Title: Re: Grape juice wine sugar content.
Post by: coop-de-tat on October 19, 2013, 13:29: Hey much obliged VG7!

I'll do exactly what you calculate and add sugar until the hydro reads 1090.

Thanks again!!!!

CdT
Title: Re: Grape juice wine sugar content.
Post by: Capt Zero on October 20, 2013, 07:21: Quote
VegGirl7... My maths is not the greatest!! but by my simple calculations 16.3g/100ml is the equivalent of 740.998g/gallon so you need to add 324g sugar / gallon to increase the SG to 1090...
I think that's right :unsure:

Spot on....and like you I find it easier to use my hydro. If anyone reading this is new to using an hydrometer, please note that they are calibrated at 20c, although some are 15c it should state on the hydro.