Kegconnection Complete Starter Kit and More Giveaway!


Home Brew Forums > Home Brewing Beer > General Beer Discussion > How to adjust mash ph

Reply
 
LinkBack Thread Tools
Old 02-04-2013, 08:08 AM   #1
Wheelspin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2012
Location: Johannesburg, South Africa
Posts: 118
Liked 5 Times on 3 Posts
Likes Given: 9

Default How to adjust mash ph

I got a PH meter last week and used it in a Pale Ale brew.

After mashing in I took a reading and got 5.8.

Using phoisphic acid, how would I adjust this down to 5.3.

A website I came across suggested the following formula to adjust PH.

mL of lactic acid needed = change in pH x weight of grain in lbs.

In my case 8 ml = .5 x 16 and I used phosphoric acid 85 % instead of lactic acid.

So I added about 8 drops of phosphoric acid ( I read that 1 drop is ± 1 ml) but when I tool PH reading again the PH had not changed at all.

Was this because I used phosphoric acid instead of lactic acid ?

Could anyone comment on this and maybe suggest a formula using phosphoric acid.

__________________
Wheelspin is offline
 
Reply With Quote Quick reply to this message
Old 02-04-2013, 05:53 PM   #2
Wheelspin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2012
Location: Johannesburg, South Africa
Posts: 118
Liked 5 Times on 3 Posts
Likes Given: 9

Default

Bump bump bump

Surely someone can enlighten me ?????

__________________
Wheelspin is offline
 
Reply With Quote Quick reply to this message
Old 02-04-2013, 06:00 PM   #3
Yooper
Ale's What Cures You!
HBT_ADMIN.png
Feedback Score: 0 reviews
 
Yooper's Avatar
Recipes 
 
Join Date: Jun 2006
Location: Upper Michigan
Posts: 60,338
Liked 4276 Times on 3115 Posts
Likes Given: 822

Default

What strength is the phosphoric acid? Most lactic acids are 88%, but my phosphoric acid is like 10%. That means that they aren't a 1-for-1 substitution.

I use this chart for adjusting mash pH: http://braukaiser.com/wiki/index.php...l#Adding_acids
(Scroll to table 3, near the bottom). I keep that chart in my brewing area.

__________________
Broken Leg Brewery
Giving beer a leg to stand on since 2006
Yooper is offline
 
Reply With Quote Quick reply to this message
Old 02-04-2013, 10:15 PM   #4
BigEd
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2004
Posts: 2,329
Liked 112 Times on 99 Posts
Likes Given: 15

Default

Unless you have very odd water you shouldn't have to add any acid as long as the Calcium content is high enough and the water is balanced correctly for the grist. You do need to know what is in your water as an all-grain brewer. Get a report from your water supplier or have a lab test it for you. Check out the Brew Science section here at HBT for a wealth of brewing water information and links to water calculators.

__________________
BigEd is offline
 
Reply With Quote Quick reply to this message
Old 02-04-2013, 10:34 PM   #5
diverpat
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
diverpat's Avatar
Recipes 
 
Join Date: Dec 2010
Location: Wilmington, NC
Posts: 106
Liked 8 Times on 8 Posts
Likes Given: 3

Default

Quote:
Originally Posted by Wheelspin View Post

So I added about 8 drops of phosphoric acid ( I read that 1 drop is ± 1 ml) but when I tool PH reading again the PH had not changed at all.
There is about 20 drops to a ml.
__________________
diverpat is offline
 
Reply With Quote Quick reply to this message
Old 02-05-2013, 05:53 AM   #6
Wheelspin
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2012
Location: Johannesburg, South Africa
Posts: 118
Liked 5 Times on 3 Posts
Likes Given: 9

Default

Big thanks for the responses.

Yooper, the phosphoric acid is 85 % (BTW just bottled your Yoopers Pale Ale - AWESOME !! thank you)

BigEd, I'm attaching what I believe to be the water report for my area but don't know how up to date it is.

Diverpat, so I should have put in about 160 drops ??

jhb-water-analysis.png  
__________________
Wheelspin is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
When do i adjust the pH in my mash. SOMDBrewer All Grain & Partial Mash Brewing 9 01-28-2013 06:11 PM
When is it too late to adjust ph in the mash? EllisTX Brew Science 5 02-26-2012 12:00 AM
How do i adjust mash/sparge ratio for large AG bills? je52rm All Grain & Partial Mash Brewing 10 01-06-2012 11:42 PM
new mash tun - adjust strike water temp? JLem Brew Science 9 01-19-2010 02:36 PM
How important is it to adjust mash pH? mroberts1204 All Grain & Partial Mash Brewing 21 08-02-2009 04:59 PM