YKS 2022 · Soru 80

(I) The principal task of a shampoo is to clean the hair. (II) For that purpose, shampoo contains surface-active substances, so-called surfactants, that become attached to the water-insoluble dirt and fat deposits in the hair. (III) Subsequently, they are washed away again with water when the hair is rinsed and shampoo removed. (IV) Sodium laureate sulphate is what makes the shampoo foam. (V) We should, however, be careful about removing too much fat from the hair because the fatty substances also have a protective function.