The SG of the must as a whole should be 1.080 ish, regardless of the ingredients.
I would do the following:
Dissolve the approximate amount of sugar in boiling water and allow to cool, in a jug (or two).
Drain the fruit cocktail juice/syrup into your fermenter. Rinse the fruit with water and add this to the fermenter.
If you are going to add grape juice, do it now.
Now add some of the dissolved sugar to the fermenter, mixing with plain water, bringing it up to the desired level, mixing thoroughly and checking SG regularly. The aim is to end up with the correct SG and the correct volume of must at the same time
There will be a small amount of sugar in the fruit, but not much - most will be in the syrup/juice, so the SG won't change much.
You can get a bit more scientific - an SG of 1.080 corresponds to 208 grammes per litre, so if you are OK at maths you can calculate the required sugar based on the sugar content of the tinned fruit (and the grape juice) - you must use your hydrometer to get to the required SG but this will get you pretty close.
I hope this helps.
I would do the following:
Dissolve the approximate amount of sugar in boiling water and allow to cool, in a jug (or two).
Drain the fruit cocktail juice/syrup into your fermenter. Rinse the fruit with water and add this to the fermenter.
If you are going to add grape juice, do it now.
Now add some of the dissolved sugar to the fermenter, mixing with plain water, bringing it up to the desired level, mixing thoroughly and checking SG regularly. The aim is to end up with the correct SG and the correct volume of must at the same time
There will be a small amount of sugar in the fruit, but not much - most will be in the syrup/juice, so the SG won't change much.
You can get a bit more scientific - an SG of 1.080 corresponds to 208 grammes per litre, so if you are OK at maths you can calculate the required sugar based on the sugar content of the tinned fruit (and the grape juice) - you must use your hydrometer to get to the required SG but this will get you pretty close.
I hope this helps.
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