Sodium Hydroxide → Sodium Nitrate

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Currently, the KSC oxidizer scrubbers react nitrogen tetroxide and/or nitrogen dioxide with nominally 25-weight-percent sodium hydroxide, which produces sodium nitrate, sodium nitrite, and nitric oxide. Nitrogen dioxide is in equilibrium with nitrogen tetroxide in the gas phase, reaction 1-61. Nitric oxide is not a primary gas-phase reactant, but it is produced during the liquid-phase reactions 1-65 and 1-66. Once produced, nitric oxide can either combine with nitrogen dioxide, reaction 1-62, or be oxidized by oxygen in the scrubber to nitrogen dioxide, reaction 1-63, to be reabsorbed in the scrubber liquor, reactions 1-64 to 1-67. However, the nitric oxide can escape reaction with the scrubber liquor be released into the atmosphere.

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