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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 what should you use to adjust the pH of the water? Well, acetic acid (vinegar) is readily available and can be added to water in the spray tank in small increments; check periodically with pH paper. Itâs important to avoid adding too much vinegar since the water pH should be around 6.5.