The Urbana wastewater treatment plant discharge permit limits the discharge of ammonia/ammonium (NH3/NH4 ). To meet this permit, the ammonium is converted to nitrate (NO3 - ) by biological nitrification in trickling filter towers. The solution entering the nitrification towers contains 15 mg/L of NH4 as N. Write a balanced reaction for the oxidation of NH4 to nitrate,

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.