Here's the writeup for the bromate salt, nitrate is the same just don't add the sodium bromate.
Preparation: Two solutions are made, for the first 1.49g (0.02mol) of nickel oxide is dissolved into 20mL of boiling 68% nitric acid and allowed to
boil dry on a 200 degree hotplate. The remaining nickel nitrate in the form of a yellowish green plate is redissolved into 50mL of water. 6.04g
(0.04mol) of sodium bromate is now added and dissolved.
For the second solution 5.45g (0.04mol) of aminoguanidine bicarbonate in 50mL of water is dissolved by the addition of 3.70g (0.04mol) of 68% nitric
acid with the release of carbon dioxide gas. This solution is then freebased by the addition of 1.60g of sodium hydroxide in 10mL of water, solution
turns from yellow to orange.
The first solution is rapidly stirred as the second solution is slowly poured in, the mixture quickly turns dark bluish purple and within 10 seconds a
brick red precipitate fills the liquid. This was left to stir for 15 min then filtered and dried, yield 7.70g (83% to bromate, 116% to nitrate).
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