What is an acid based marinade?

Chef's answer
Acid bases include vinegar, wine, citrus juice, and tomatoes. Acidic marinades might actually toughen chicken. So when using a highly acidic marinade for chicken, add a little olive oil and/or minimize marinating time. Two hours is usually more than enough time.
Frequently asked Questions 🎓
Heat 1 cup of sauce with 1/4 teaspoon baking soda (baking soda neutralizes acidity). Taste the sauce and add tiny amounts of baking soda to see if it mellows the acidity. If there is still an edge, swirl in a teaspoon of butter, letting it melt until creamy. Usually this does the job.
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