For 10 points, name this type of aqueous system that resists changes in pH.
A mixture of phosphoric acid and ammonium nitrate with hydrogen is used as one of these in the production of caprolactam. Organic acids in plant vacuoles and ammonia in urine are examples of it, as are ATP and histidine. The gas and dissolved equilibrium of carbon dioxide contributes to the carbonic acid-bicarbonate system in blood, while the phosphate system acts in extracellular fluids. Metabolites and amino acids with ionizable groups work best because they are weak acids or weak bases. For 10 points, name this type of aqueous system that resists changes in pH.
A mixture of phosphoric acid and ammonium nitrate with hydrogen is used as one of these in the production of caprolactam.
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