Can I lower the pH of Pure-Castile Soap with vinegar?Updated a year 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 anything acidic (e.g.: lemon juice, vinegar, citric acid) the acid will react with the alkaline soap and break apart the soap molecule. The pH will be lowered, but you will no longer have any soap to clean with. For a deeper dive into the topic of pH, check out Lisa Bronner's blog post Skin Health, pH, and Dr. Bronner's