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Why can't nitric acid and acetic acid be stored together?

Nitric acid, when combined with acetic acid on a tile/concrete floor, will sometimes create a fire. This situation has occurred enough times that we feel nitric acid should be stored in the same cabinet but kept separate from acetic acid. A special nitric acid compartment has been developed to fit into your existing acid cabinet. (See the Safety Storage Cabinets section of our Flinn Scientific Catalog/Reference Manual.) This unique secondary containment device will provide ample protection for nitric acid.

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