1.

Can you concentrate nitric acid beyond 68% by boiling, if not then how is it concentrated ?

Answer»

Solution :No, dilute nitric acid cannot be concentrated beyond 68% by boiling. It can be concnetrated b y distilling it with concentrated sulphuric acid under reduced PRESSURE.
Pure 100% nitric acid is obtained by cooling the 98% acid when COLOURLESS crystals of pure nitric acid get SEPARATED at -`42^@C`.


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