Maths for Sugar Additions

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iVivid

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Can someone check me because I'm not very savvy at this:

I'm making Kiwifruit Wine.
The juice measured 1.060, strained, got 1.050.
I added a bottle of Welches White Grape which was 1.070 and 1.36 litres.

My total qty is 5 litres therefore :

1.36 litres @ 1.070
3.64 litres @ 1.050

So
73% of the must is 1.050 (7% pa) = 5.11%
27% of the must is 1.070 (9.5% pa) = 2.56%
so the pa of the total 5 litres is 7.67% yes?

So to increase the pa to ~10% (my goal as JohnT says to use that for sparkling).
Need to up ~3% pa; I understand the following formula to be correct?
3g of sugar increase the pa by 0.001 in 1 litre;
I need to increase the pa by 3% pa (looking at the hydrometer thats 1.023 as a measure)
so 3g x 0.001 x 23 x 5 litres = 345g sugar.

OMG I so hope this is right; can someone check for me if I'm on the right track?
Thanks so much!
Viv

PHEW!
 
According to my calculations 345 grams is pretty close. I came up with 323 grams if you were shooting for 1.080.

I did this by saying that 1.080 was equivlent to 215 grams/liter sugar. Multiply by 5 liters to equal 1075 grams of sugar.

I then took the sugar contribution of each portion of your juice 1.070 at 1.36 liters is like 189 gram/ liter *1.36 liter and 1.050 is around 136 gram/liter *3.64 liters.

This indicated to me you had a total of 752 grams of sugar. 1075-752= 323 extra grams of sugar needed.


http://www.brsquared.org/wine/CalcInfo/HydSugAl.htm
 
22g out I can deal with lol.
Cheers
Seth.
Thanking you.

It looks like I went a very complicated way of calculation something that may have been simpler the way you did it!
 
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