Inorganic reactions
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In the back titration of insoluble metal carbonates with standard nitric acid and sodium hydroxide solution, why are dilute HCl and H2SO4 are not suitable?
Corrie writes ...
HCl and H2SO4 are not used because the metal involved may form an insoluble chloride (e.g. Ag+ ) or sulphate (e.g. Pb2+). As all nitrates are soluble, all metal carbonates should dissolve in excess dilute nitric acid, the remaining nitric acid then determined by back titration with NaOH.
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updated: 23 October 2007
