BlueBru Posted May 18, 2019 Share Posted May 18, 2019 Can somebody please tell me how to estimate a new OG if you make additions after taking your original reading. I have just put down a brew and the OG was 1040. I was happy with that so added the yeast. After 15 minutes or so I added 400g of disolved dextrose to increase the ABV. What would my new OG be? Link to comment Share on other sites More sharing options...
Otto Von Blotto Posted May 18, 2019 Share Posted May 18, 2019 That depends on the volume of the batch? Link to comment Share on other sites More sharing options...
Beerlust Posted May 18, 2019 Share Posted May 18, 2019 10 minutes ago, Otto Von Blotto said: That depends on the volume of the batch? Yep. +1 How much liquid did you dissolve the dextrose in? This also increases the batch volume further. Cheers, Lusty. Link to comment Share on other sites More sharing options...
BlueBru Posted May 18, 2019 Author Share Posted May 18, 2019 Initial batch was 23 litres. Dextrose was disolved in less than 200 ml of hot water. Link to comment Share on other sites More sharing options...
Otto Von Blotto Posted May 18, 2019 Share Posted May 18, 2019 400g dextrose would increase the OG by approximately 0.007 in 23 litres. As for the how I calculated that, 100g dex in a litre gives an SG of about 1.039, or 39 SG points. 400g in 23.2 litres is 17.2g/L. 39 X 0.172 = 6.7, or approximately 7 SG points. Link to comment Share on other sites More sharing options...
BlueBru Posted May 18, 2019 Author Share Posted May 18, 2019 thanks OVB. exactly what I was looking for. your the man! Link to comment Share on other sites More sharing options...
BlueBru Posted May 18, 2019 Author Share Posted May 18, 2019 OVB: So if Iunderstand correctly, I now have an OG of 1047? Link to comment Share on other sites More sharing options...
Beerlust Posted May 18, 2019 Share Posted May 18, 2019 Theoretically, it could be anything. Draw half a tube sample off & tip it, then draw a full sample off & measure it with a hydrometer for an exact gravity. The yeast would have done f'all in 3 hours. Cheers, Lusty. Link to comment Share on other sites More sharing options...
Otto Von Blotto Posted May 18, 2019 Share Posted May 18, 2019 Lusty, it's a known weight of sugar in a known volume of liquid. 100g dextrose in a litre of water is always going to result in the same SG. The OG can't be "anything", it will be a specific figure, which is easily calculated. 1.047 is a pretty accurate calculation based on the information provided. Link to comment Share on other sites More sharing options...
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