Hydroxide Precipitation Methods of Metals In An Insoluble Form

The FeS is precipitated by reacting solutions of an iron salt such as ferric chloride FeCl 3 or ferrous sulfate FeSO 4 with sodium Na 2 S or sodium hydrogen NaHS, with the addition of an alkaline such as sodium hydroxide NaOH to raise the pH above 7 to prevent evolution of hydrogen H 2 S gas. It can also be ...

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