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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.
One underlying theory here is that the acetic acid in vinegar lowers stomach acidity (increases its pH) since acetic acid is a weaker acid than hydrochloric acid. It is also believed that vinegar (acetic acid along with its acetate salt) may help buffer and maintain stomach acid at a pH level of about 3.0.wo approaches commonly advocated for the treatment of heartburn or acid reflux include: Vinegar and Acid Reflux-The Natural Home Treatment. 1  Using medication to reduce stomach acid. 2  Over-the-counter antacids are often used to decrease or completely neutralize the amount of acid in the stomach.