I had a sample in shot glass. I checked its ph, it was 3.57. I put the glass in a ziplock sandwich bag and planned to check the TA the next day. Before I did the TA test I checked the ph again and it was now 3.4. If anything it should have gone up as carbonic acid left the solution. Why did the ph drop? Is this sample still representative of the batch after sitting. Does this mean the TA is inaccurate.
Thanks
Thanks