Acids & Alkalis

If you apply bleach with a pH of 10 to hair, what pH level should a conditioner have to balance it out?

• 5

• 7

• 10

• 14

On the pH scale, which number represents a strong alkaline substance?

• 14

• 7

• 5

• 1

What does litmus paper indicate about a substance?

• Whether a substance is an acid or an alkali

• The strength of an acid or alkali

• The exact pH value of a substance

• The temperature of a substance

What is the typical pH range of human skin and hair?

• 3.0 to 4.0

• 4.5 to 5.5

• 6.0 to 7.0

• 7.5 to 8.5

What should you consider first when evaluating a product or ingredient for skin, hair, or nails?

• The color of the product

• The price of the product

• What the product is doing to the skin/hair/nails

• The brand of the product

What type of product is likely to create permanent change or damage?

• Acid

• Alkali

• Neutral

• Base