Also, what did you hope to have achieved by that? A dried beer? Dextrose ferments down a lot further than DME or LME (which have unfermentable sugars/chemicals in them).
It will most likely be a higher alc, fairly watery beer? I'm speaking purely on speculation here as I have never brewed a batch with extract...
What I was going for, was a fuller bodied beer. I read that dextrose only adds alcohol and not much else to beer, and that to improve a kit, add extract instead. Bad info? Did I misinterpret what I was supposed to be adding instead of dextrose?
You're correct, dextrose will make the beer very thin bodied as it is fully fermentable.
When I've made starters with LME in the past, I saw that you really had to work it in, it is so high in gravity that it just sinks.
Also, LME is not pure sugar, right? Did the kit recipe call for 1 kg dextrose?
A number that I've found for LME is 78-80 Brix, with 39 to 40 Brix being fermentable sugar (Maltose).
So if you add 1 kg of LME, you add 400 g of fermentables and about 800 grams of total solids (all inclusive, including the fermentables) and 200 g (=mL) of water.
So if you look at 20 L, you add 1 kg LME you're probably at 20.2 L.
80/20.2 = ~4 brix, so in theory you should be at about 1.016 with half of it fermentable, so you FG should come out to about 1.008. Now that can vary from LME to LME (don't know which LME you used).
I'm by no means an expert in extract brewing, but what else did you put in aside from the LME/DME in it?
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I'm also guessing that your hydro sample was flawed because your swirl didn't mix the LME and pre-hopped extract into the top up water very well. At that point, adding oxygen is welcomed, you can beat the hell outta it. The swirl is used when transfering into a bottling bucket and batch priming finished beer to bottle carbonate.
I'll remember to "beat the heck outta it" next time, as Smokey suggested, and THEN take a hydrometer reading. I just swirled it around for a short period of time to make sure there were no visible "layers" of material and nothing sitting on the bottom of the carboy.
Now that I've pooched my original hydro reading, is there any way to estimate the ABV? Just curious now, of course...
As well, if I use LME as a substitute for dextrose in the future, should I be adding a little dextrose back to maintain the potential alcohol content?
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