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Calculating molarity of HCl based on change in total alkalinity?

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user 246304

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Hi guys with better brewing chemistry than me.

My tap: TA 314
I added in my (diluted) HCl at the rate of 2.25 ml/gallon tap, or .59 ml HCl/Liter of tap.

I got to 77 TA (where I want it, actually, for dark ales - milds, porters etc).

Playing catchup on stoichiometry and need a check on this. A British brewer got me started, with the following sets of equations - but this is for determining the molarity of the H2SO4 I also use, works because H2S04 and CaCO3 both have a valence of 2.

So, just checking to see if I have this right, with the HCl I use.

Reduction in alkalinity / necessary volume of acid /molar mass of alkalinity = molarity of acid

(314-77)/.59 ml HCl/100.09 Molar mass alkalinity as CaCO3.

= 4.01. But because unlike H2SO4 and CaCO3, each having a valence of 2, here, HCl has vilence of 1 and CaCO3, 2.

So, the molarity of this HCl is (2 x 4.01) = 8 M, correct?
 
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