Other uses for RFNA include fertilizers, dye intermediates, explosives, and pharmaceutic aid as acidifier. It is used as a urine acidifier to reduce urinary stones in cats. A balanced chemical leavening such sodium bicarbonate, along with an acidifier is another common ingredient. The type of acidifier used depends on when the preferred release of CO is. It is used widely as an acidifier, as a flavoring and a chelating agent.