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acetic acid acid and dilute add 1 ml allow to stand ammonium hydroxide ammonium persulfate ammonium persulfate crystals ammonium sulfide ammonium thiocyanate reagent Arsenic barium chloride reagent cent sodium hydroxide chloric acid chloride ion chloride reagent solution containing the quantities Cool dilute hydrochloric acid dilute to 50 Dissolve 1 gram distillate equal volume evaporate to dryness exceed that produced flask Formula Wt grams in 100 Heat to boiling Heavy metals hydrochloric acid hydrogen sulfide water ignited precipitate Iron Fe metals as Pb nitrate reagent solution nitric acid pass test limit phenolphthalein pink color produced by 0.01 quantities of reagents red color Requirements Insoluble matter Residue after ignition sample solution silver nitrate reagent sodium carbonate sodium hydroxide sodium hydroxide solution solution add solution containing stand overnight steam bath Substances not precipitated sulfuric acid tared filtering crucible Tests Insoluble matter thiocyanate reagent solution turbidity volume of solution wash water and add