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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.
So drinking vinegar, which has a pH of around 2.9 will make the stomach more basic, since it will increase the pH to its normal value. That is the reason why the basic is written in quotations. The pH scale tells us acidity and basicity.