When i did this to make my Barium Nitrate, make sure it doesnt get to hot or regardless cause mine started reacting with whatever container it was in, the nitric acid i bought was 98% or something, fuming white (no questions asked either :S). If i didnt dilute it, it would never react. I remember a mate telling me the way he does it was he would add however much nitric acid to a large hdpe bucket, then he would add an excess of carbonate, then just add water till the reaction stopped, filtered and wallah good barium nitrate.
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