GROUP IV. and V. CATIONS
20 drops of sample 1 micro spoon NH 4 Cl 10 drops if liquid NH 4 OH until the solution is basic 20 drops of 15 M NH 4 2 CO 3 Centrifugate 3000 rpm 4 min GROUP IV CATIONS Ba
min supernatantdropsprecipitatesupernatantminrpmaddcentrifugatethrowwaterdistilledcationsdissolveconcentrated
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