*Ss Brewing Technologies Giveaway - Enter Now!*

 Home Brew Forums > Determining the amount of lactic acid to add to sparge water
11-09-2011, 02:59 PM   #1
jmf143
Feedback Score: 0 reviews
Recipes

Join Date: May 2010
Location: Wixom, Michigan
Posts: 607
Liked 18 Times on 17 Posts
Likes Given: 2

 Determining the amount of lactic acid to add to sparge water

Is there a "quick and dirty" method of determining the amount of lactic acid 88% to use to drop sparge water pH by a constant amount i.e. "1 ml of lactic acid in 1 gallon of sparge water will reduce pH by X units"?

__________________
Vir sapit qui pauca loquitur

11-09-2011, 04:15 PM   #2
ajdelange
Senior Member
Feedback Score: 0 reviews
Recipes

Join Date: Aug 2010
Location: McLean/Ogden, Virginia/Quebec
Posts: 5,999
Liked 594 Times on 491 Posts
Likes Given: 17

The amount required depends on the original pH and alkalinity of the water and the pH you want to shift it to. Bru'n water has a calculator.

__________________

11-10-2011, 07:27 PM   #3
jmf143
Feedback Score: 0 reviews
Recipes

Join Date: May 2010
Location: Wixom, Michigan
Posts: 607
Liked 18 Times on 17 Posts
Likes Given: 2

Quote:
 Originally Posted by ajdelange The amount required depends on the original pH and alkalinity of the water and the pH you want to shift it to. Bru'n water has a calculator.
I am aware of this but could have worded my question better. Assume that my tap water pH is 8.1, I'm aiming for a sparge pH of 5.7 and I want to sparge with 6 gallons. Bru'n Water will calculate for the sake of argument 3 ml of lactic acid for me. Can I assume I can always add .5 ml of lactic acid per gallon of sparge water regardless of the grain bill, batch size etc. since 3 ml / 6 gallons = .5 ml lactic acid per gallon of sparge water?
__________________
Vir sapit qui pauca loquitur

11-10-2011, 08:01 PM   #4
remilard
Feedback Score: 0 reviews
Recipes

Join Date: Nov 2008
Location: Kansas City
Posts: 3,655
Liked 38 Times on 37 Posts

Quote:
 Originally Posted by jmf143 I am aware of this but could have worded my question better. Assume that my tap water pH is 8.1, I'm aiming for a sparge pH of 5.7 and I want to sparge with 6 gallons. Bru'n Water will calculate for the sake of argument 3 ml of lactic acid for me. Can I assume I can always add .5 ml of lactic acid per gallon of sparge water regardless of the grain bill, batch size etc. since 3 ml / 6 gallons = .5 ml lactic acid per gallon of sparge water?
Assuming the same water composition and target pH, yes, the amount of acid required is a linear function of the amount of water treated.
__________________