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I would like to know the safest method for neutralizing 70% ACS Reagent Nitric Acid that is used in small amounts of 1-5 ml, for an electronics process in which there will be small traces of silicone and other similar trace materials dissolved into it, to safely contain for proper disposal to not be a risk for acid accidents or fire/explosion risks. Should a calcium carbonate-water mixture be used to increase $\mathrm{pH}$ slowly or is this method still unstable from higher purity of $\ce{HNO3}$ being involved or?

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    $\begingroup$ Dilute it with water then cautiously add carbonate until no further foaming occurs. $\endgroup$ – Waylander Mar 23 '18 at 9:24

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