Separation of the Alkali-group Solution IV

Adsorbents with starch as binder must be used here too as a result of interference by gypsum acetate anions are necessary in this group also. Alkali salts of strong acids can be converted into acetates with the help of an anion exchanger in the acetate form but this is comparatively protracted. Exchange on the layer itself is simpler Ba ions remain 

Standard samples 1 (xl of M solutions of Id, Na, K and Mg acetates, all slightly acidified with acetic acid, are applied as separate spots in a row. 

Detection The layers are sprayed with 1.5% violuric acid in distilled water and heated 20 min at 100° afterwards in a drying oven (Table 220). 

Color with violuric acid light red yellow-orange red-violet blue-violet 

Lesigang [13] has separated the ions of this group on layers of the salts of heteropoly acids. 

---