Can someone please explain me this problem and explain where they got the number
ID: 486760 • Letter: C
Question
Can someone please explain me this problem and explain where they got the numbers from. Thank you.
Nitrogen in water can cause problems in some lakes and rivers. Wastewater typically contains a good deal of nitrogen as ammonia, NH_3, and ammonium ion, NH_4^+. One way to get rid of nitrogen is to strip" NH_3 from the wastewater with air. The NH_3 is not very soluble in water and will want to leave with the air, so if we can get more of the nitrogen in the form of NH_3 we have a better chance to remove the nitrogen. The equilibrium reaction is the following NH_3 + H_2O doubleheadarrow NH_4^+ + OH^- If we want to help the stripping process would it be better to have a pH of 10 or 6? Prove your answer!Explanation / Answer
answer : pH = 6
explanation:
we know that pKb of NH3 = 4.74. and NH3 is a base .so the pH of the solution will be definately more than 7.
inorder to remove nitrogen that is NH3 we need to use acidic solution. the acidic solution pH will be less than 7. so pH = 6 is the only chance to remove base. if we use pH= 10 . it is also basic solution we cannot use it remove NH3