What is the pH range commonly associated with conditioners?

• A. 3.5 - 5.5
• B. 7.5 - 9.0
• C. 6.0 - 7.0
• D. 2.0 - 3.0

Answer: (A)

Conditioners are designed to be slightly acidic to help close the hair cuticle after washing. Hair fibers prefer a pH in the acidic range, roughly 4.5 to 5.5, which allows the cuticle scales to lie flat. When the cuticle is smooth, hair feels softer, detangles more easily, and retains moisture better. If a product is too basic (pH above 7), the cuticle lifts and hair can become frizzy and rough. Near-neutral ranges (around 6–7) don’t close the cuticle as effectively, and very acidic products (below pH 3) can be harsh for the scalp and hair. So, the pH range commonly associated with conditioners is about 3.5 to 5.5.