All carbonates(CO32-), chromates(CrO4 2- ) and phosphates(PO4 3- ) are insoluble except ammonium and alkali elements.
All hydroxides (OH-) are insoluble except those of alkali elements, ammonium ions, except Sr2+ , Ba2+ and Ca2+
All metal sulfides (S 2- ) are insoluble except those of alkali elements and ammonium ions
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