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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.
Soda, no matter who makes it, is the most acidic beverage you can buy, with a pH of about 2.5 1, about the same as vinegar, but the sugar content disguises the acidity. To put that into perspective, consider that battery acid has a pH of 1 and pure water has a pH level of 7.