102. Solving a chemistry problem

5. Expand the essence of fractional and systematic methods of analysis. Suggest options for the separation and detection of cations in the solutions below, which are a mixture of cations of various analytical groups, by fractional and systematic methods. Describe in detail the method of determination in a systematic way. Make up the equations of the corresponding reactions, indicate the conditions for the reactions to occur.
17. Na , Ca2 , Zn2 , Cu2