TA test not going as expected?

Discussion in 'Tutorials, Calculators, Wine Logs & Yeast Charts' started by jasonclick, Sep 4, 2019.

Wine Making Forum

Help Support Winemaking Talk by donating:

  1. Sep 4, 2019 #1

    jasonclick

    jasonclick

    jasonclick

    Junior

    Joined:
    Feb 7, 2018
    Messages:
    11
    Likes Received:
    0
    Gender:
    Male
    Location:
    Green Cove Springs, Florida
    newbie winemaker question... i put together 2 wines last year... the white (muscadine) in August and the red (cab sav) October. Anyways after primary fermentation i transferred these to 5 gallon stainless kegs and haven't touched them since. Before i transferred them the white TA was 9g/L and the red was 7.5g/L.
    I did a TA test this morning (Titratable Acidity Testing Kit from morewinemaking.com) and didn't get a color change from either. When i measured the pH of the wines with my pH meter, the white was 2.93 and the red was 4.04.
    Any reason why the pH would be low but test shows no TA? maybe a need a refresher on how to do the test?
    Help! I'm off today for our little hurricane happening so i'd like to get these wine chores done today.
     
  2. Sep 4, 2019 #2

    cmason1957

    cmason1957

    cmason1957

    CRS Sufferer WMT Supporter

    Joined:
    Aug 5, 2011
    Messages:
    2,892
    Likes Received:
    1,898
    Instead of trying to guess when the color change happened, put your ph meter to use. The color change happens at a ph of 8.2 so titrate until that point. Go slowly once you get close.

    If your cab Sauv ph is 4.04,you probably need to add some tartaric acid, but let taste be the guide. I would assume it might taste a bit flabby and boring, but it might be fine.
     
    Chuck E likes this.
  3. Sep 5, 2019 #3

    jasonclick

    jasonclick

    jasonclick

    Junior

    Joined:
    Feb 7, 2018
    Messages:
    11
    Likes Received:
    0
    Gender:
    Male
    Location:
    Green Cove Springs, Florida
    thanks for the reply. i'll give another shot using the ph meter
     
  4. Sep 5, 2019 #4

    GreginND

    GreginND

    GreginND

    Super Moderator Super Moderator

    Joined:
    Mar 18, 2012
    Messages:
    3,561
    Likes Received:
    1,778
    Location:
    Fargo, ND
    is your sodium hydroxide still good?
     
    cmason1957 likes this.
  5. Sep 5, 2019 #5

    jasonclick

    jasonclick

    jasonclick

    Junior

    Joined:
    Feb 7, 2018
    Messages:
    11
    Likes Received:
    0
    Gender:
    Male
    Location:
    Green Cove Springs, Florida
    i'm not sure. i bought it about a year ago. so not sure the shelf life.
     
  6. Sep 5, 2019 #6

    Johnd

    Johnd

    Johnd

    Large Member WMT Supporter

    Joined:
    Jun 11, 2015
    Messages:
    5,255
    Likes Received:
    4,676
    Location:
    S Louisiana
    At a year or more of age, it'd be worth every penny to get some fresh stuff, it loses it's potency over time and will give you TA levels that are not correct.
     
  7. Sep 6, 2019 #7

    Sailor323

    Sailor323

    Sailor323

    Junior

    Joined:
    Apr 19, 2019
    Messages:
    17
    Likes Received:
    4
    Gender:
    Male
    The published shelf life of N 10 NaOH is about 2 years. That being said, I just compared a 20 year old sample with a brand new one and there was no significant difference. You can Standardize your solution with Potassium Acid Phthalate. pH does not test for TA.
     

Share This Page