Vinegar vs Acid Citric

[KimooLee]

I have question about vinegar and acid citric ?

1. For Brine - what is different to get low pH with acid citric and viegar ?
2. I check post and always have words about vinegar >  ?
3. Acid Citric vs VINEGAR profits ??

[John@PC]

Hi faton and welcome.  I'll let one of the experts answer the question (which is whether you can substitute vinegar for citric acid?) but also add another question:  What should brine pH be?  I know I've seen the formula for adding citric acid and calcium chloride but if you have a brine made up (just salt) can you just check pH and acidify to a target?