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add 1 ml aliquot allow to stand ammonium hydroxide ammonium persulfate ammonium thiocyanate ammonium thiocyanate reagent barium chloride reagent brucine carbon tetrachloride cent sodium hydroxide cent solution chloric acid chloride reagent solution containing the quantities Control Solution cool covered beaker digest dilute hydrochloric acid dilute to 100 Dissolve 1 gram Dissolve the residue equal volume evaporate to dryness exceed that produced filtrate flask Formula Wt grams in 100 grams in water heat to boiling Heavy metals hydrogen sulfide hydrogen sulfide water hydroxide reagent solution iron Fe lead ion Pb metals as Pb nitrate reagent solution nitric acid potassium produced by 0.01 quantities of reagents red color Residue after ignition Sample Solution separatory funnel silver nitrate reagent sodium carbonate sodium hydroxide sodium hydroxide reagent solution add solution containing steam bath sulfate reagent solution Sulfate S04 sulfuric acid tared filtering crucible thiocyanate reagent solution turbidity volume of solution wash water and dilute