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Which process is used in order to concentrate nitric acid?(a) Concentration by H3PO4(b) Concentration by Mg(NO3)^2(c) Concentration by Ca(NO3)^2(d) Concentration by Ba(NO3)^2This question was addressed to me in examination.My doubt is from Inorganic Chemical in division Inorganic Chemical Industries of Chemical Technology

Answer»

Right answer is (b) Concentration by Mg(NO3)^2

For explanation I would SAY: Magnesium nitrate solution containing 70-75% Mg(NO3)^2 is fed to a dehydrating tray tower ALONG with dilute HNO3 from the absorption system. The salt solution act as an EXTRACTIVE distillation AGENT, removing water at 100 C and the solution is again re- concentrated by evaporation.


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