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I am trying to perform the demonstration of a strongly endothermic reaction reacting barium hydroxide with ammonium nitrate. I have been scouring the web for ways to get barium hydroxide, but none have showed any promise. The only way I have seen to obtain it is by heating the nitrate to decomposition and reacting the oxide with water. I would rather avoid this as I have no way to deal with the nitrogen dioxide gas that would result.

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    $\begingroup$ Google buy barium hydroxide. You'll find several sellers on various science sites and eBay. There are at least 5 different vendors I found immediately. You can also buy barium oxide and dissolve it in water. $\endgroup$ – Jason Patterson Sep 30 '15 at 1:33
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You can buy barium hydroxide. See the listing from Flinn Scientific although Flinn is by no means the only seller. However, Flinn's safety information is written at a very accessible level.

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    $\begingroup$ Flinn will only sell to certified teachers and schools $\endgroup$ – popgalop Sep 30 '15 at 1:01

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