Yooper

Recipes 

I have a fresh bottle of phosphoric acid. I've never used it before, but I saw on Braukaiser's website that 0.1-0.135 ml would lower mash pH by 0.1, while the amount of lactic acid used for the same drop would be 0.125-0.21 ml.

I typically use 5 ml of lactic 88% in 5 gallons of sparge water. Can I assume roughly the same amount for using the phosphoric acid to start?

__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

wildwest450

Recipes 

I was always under the assumption that you used lactic acid for the mash and phosphoric only if you treated sparge water.

-

mabrungard

Recipes 

I'm hoping that there is a strength indication on that phosphoric acid, like 10% or 75%.

To get to the point, you can't assume the use of phosphoric will be like your use with lactic. The acid strength may be quite different.

There is a full-featured acidification calculator in Bru'n Water for those who wonder how much acid they should be adding to their water. That will enable Yooper to figure this problem out.

PS: you can use any type of acid you want for either mash or sparge.

__________________
Martin Brungard, P.E. D.WRE
Carmel, IN
BJCP National
Foam Blowers of Indiana (FBI)

Brewing Water Information at:
https://sites.google.com/site/brunwater/

Yooper

Recipes 

I'm having trouble with your spreadsheet in OpenOffice, so I'm not using it at this point. I'm going to try libreoffice next.

My phosphoric acid is 10%. I supposed that is important!

I decided to try phosphoric acid in my sparge water as the lactic acid I'm using IS below the taste threshold at this point, but I was thinking about make a cream ale and I didn't want any "tang" to it at all. I do use acidulated malt in the mash.

__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006

DeafSmith

Recipes 

In "Brewing Better Beer", Gordon Strong says (page 50): "Adding phosphoric acid is the easiest way to lower the pH of sparge water without adding undesirable flavors. Lactic acid is a distant second choice."

wildwest450

Recipes 

That's where I was going with my poorly worded post. Fwiw, i've never had any discernible flavors from lactic acid in the mash, even in a cap, now sauermalz, that's a different story.


_

Hermit

Recipes 

Libre Office forked from OO when Sun got stupid. They are still pretty much the same code base.

mabrungard

Recipes 

Phosphoric acid is a very good choice for brewing use. It has the least flavor impact since there are already similar anions in the mash. Adding a few more does not alter the flavor. Lactic has a distinct taste that is certainly pleasant and desirable in some styles. The same can be said for sulfuric and hydrochloric. They are just more hazardous to handle. The whole issue of taste impact is contingent upon the amount of alkalinity you're having to deal with. If its a lot of alkalinity, then other forms of treatment are probably needed.

Lorena, I had poor impressions of OpenOffice also. I've been much more impressed with LibreOffice. Its almost like using real Excel. Bru'n Water should work well for you there.

__________________
Martin Brungard, P.E. D.WRE
Carmel, IN
BJCP National
Foam Blowers of Indiana (FBI)

Brewing Water Information at:
https://sites.google.com/site/brunwater/

onthekeg

Recipes 

Phosporic is more reactive and will drop the pH much quicker than lactic. pH is logarithmic as I am sure you know, but phos will drop the bottom out very fast. Use a couple drops in the water, don't add to the mash because you will all of a sudden be at 2.0 pH.

bigbeergeek

Recipes 

What does this mean?

__________________
"Good people drink good beer." -HST