How to prepare membranes for ion-selective electrodes which contain plasticizers ortho-nitrophenyl octylether (o-NPOE), dioctylphthalate (DOP), dioctylsebacate (DOS), 2-nitrophenyl phenylether (NPPE), dibutylphthalate (DBP) and dibutylsebacate (DBS) has been shown in the thesis. The relevant electrode response characteristics to the cationic surfactant such as cetylpyridinium chloride monohydrate (CPC), hexadecyltrimethylammonium bromide (CTAB), benzethonium chloride (Hyamine 1622) and 1,3 -didecyl-2- methylimidazolium chloride (DMIC) are tested. The response characteristics to the anionic surfactant such as sodiumdodecyl sulfate (SDS) and sodium dodecylbenzenesulfonate (SDBS) were examined as well. The concentration range from 4·10-2 to 4·10-4 mol dm-3 was kept for both cationic and anionic surfactant solutions. The response characteristics were tested in destilled water at room temperature at constant pH. It has been obvious that ion-selective electrode response characteristics depend on applied membrane plasticizers. The electrodes showed different selectivity, limits of detection and the measurement range by using the same type of surfactant. The solution of the cationic surfactant Hyamine1622 has evinced the best response characteristics comparing to the all types of tested plasticizers. A deviation exists only in the membrane which contains the DBS. The response of this membrane in solution of Hyamine1622, CPC and CTAB is not suitable for further studies, and more over, the membrane is quite unstable and has short lifetime. However, in the DMIC solution and in the solutions of both anionic surfactants this membrane has showed satisfying response characteristics. The results revealed that the composition of a membrane directly affects its sensory properties of determination of anionic and cationic surfactants. In accordance with teacher preparation requirements, a unit plan for lecture called Soaps and detergents has been prepared. Lesson is designed as a combination of frontal and group work. The disciples have to meet the structure of soap and detergents, and specify their properties, which is also prove by performing experiments. After performing the experiment the disciples are expected to fill out worksheets and at the end of the lecture repeat the processed material.