Can I lower the pH of Pure-Castile Soap with vinegar?Updated 9 hours ago

Soap is and always will be alkaline. Only synthetic detergent cleansers can be acidic. When you try to lower the pH of soap with an acid (e.g., lemon juice, vinegar, citric acid), the acid will react with the soap and break its molecules apart. The pH will be lowered, but you'll no longer have any soap to use for cleaning. For a deeper dive into the topic of pH, check out Lisa Bronner's blog post Skin Health, pH, and Dr. Bronner's