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The pH of vinegar depends upon how much acid is present in it. The most commercial distilled white vinegars contain 5% acetic acid, and hence, has a pH value that ranges between 2.40 - 3.40. More Information on Vinegar and its pH Levels. Though vinegar is available in different varieties, apple cider vinegar is the most commonly used example, which is prepared from apple cider.
Vinegar is a weak acid. If my calculations are correct, then vinegar has a pH of around 2.9. You could also look over at the pK_a value, which tells how strongly it holds to a hydrogen ion. The lower the number, the more weakly it holds hence stronger the acid. [math]pK_a[/math] value of vinegar is [math]4.76 [/math]...