pH of 4% Glycolic Acid Solution

Regarding your question about the pH of a solution containing 4% Glycolic Acid (AHA) 100% Powder in distilled water, the staff has provided the following information:

• If the formula contains only Glycolic Acid and water, the estimated pH would be around 1-2.
• This is an estimation, and the actual pH must be measured directly.
• The pH can vary slightly between different production lots of Glycolic Acid.

Therefore, while the estimated pH is between 1 and 2, it is highly recommended to measure the pH of your specific formulation to get the precise value.