Math genius for acid calculation? - Home Brew Forums

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10-23-2012, 04:17 AM   #1
RobertRGeorge
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Jul 2012
Nelson, Bc
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I know someone is going to have the answer right away so here is the question:

I have 20 L of blended apple juice with .25% acid.
I have 3.78 L of crab apple juice with 1.3% acid.

What should the total acid be of the 23.78 L of juice when I mix them together?

I've tried to calculate and have come up with weird numbers.

10-23-2012, 04:38 AM   #2
outstretched
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Jun 2011
Central Oregon
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I get roughly .458% acidity with my calculations. Not sure if they are right though. Here is what I did:

First I found the concentration of each liquid (84% to 16%) then I multiplied 1.3 by .16 = .208 then you add the base acidity level of .25 to .208 and get .458%.

10-23-2012, 05:22 AM   #3

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3.78l of 1.3% = 4.914 total points. 20l of 0.25 = 5 points. 9.914 total points/23.78l = 0.41690496...blah blah blah... per liter. So, about 0.42%.
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10-23-2012, 05:47 PM   #4
RobertRGeorge
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Jul 2012
Nelson, Bc
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Quote:
 Originally Posted by outstretched I get roughly .458% acidity with my calculations. Not sure if they are right though. Here is what I did: First I found the concentration of each liquid (84% to 16%) then I multiplied 1.3 by .16 = .208 then you add the base acidity level of .25 to .208 and get .458%.
The ratio was the insight I was looking for. Using your logic I think one would multiply .25 X .84 to get the level of the base. Then it would be (1.3 X .16) + (.25 X .84) = .418