How much acid replaces 2% acid malt

[fogley]

I have been noticing some variance in the effectiveness of acid malt depending on which LHBS I go to. So I want to just add phosphoric acid 88% that I bought to do the acidifying that I want in the mash.

How do I calculate the amount of acid to add in order to get the same effect as 2% acid malt for example? Are there equations I should be using ?

 

[ajdelange]

Sauermalz generally is supposed to contain 1 - 2% lactic acid. Thus a pound of it would contain 4.54 - 9.10 grams. The equivalent weight of 88% lactic acid would be 1/.88 times this and 88% lactic acid has a density of about 1.205 g/ml if you want to measure by volume.