Lead from aqueous method and fill solvents sodium hydroxide concentration is 25 ml 0.25 North Bokmal and set aside for about 30 minutes, then fill the aqueous hydrochloric acid, the concentration 0.25 North 25 ml Bokmal, then remove the solvents have to titration with sodium hydroxide solvents at concentrations of 0.1 North point until cessation of Bokmal.
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