Mixing monosodium phosphate ( NaH 2 PO 4 ) with a solution of actinium in hydrochloric acid yields white-colored actinium phosphate hemihydrate ( AcPO 4 ?.5H 2 O ), and heating actinium oxalate with hydrogen sulfide vapors at 1400 �C for a few minutes results in a black actinium sulfide Ac 2 S 3.
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