2.8 - 3.00 pH (approximate)
Because Grapes, Concord has an approximate pH of 2.9, Grapes, Concord is considered extremely acidic and you should think twice before eating Grapes, Concord with gastritis or reflux.
Remember, everyone is different and there might be reasons besides pH that make this food intolerable, triggering of reflux, or beneficial. Check out comments below to see what other people's experiences have been with eating Grapes, Concord and please consider sharing your own knowledge to help others.
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