Question

please help with these questions !

2. Show how methylamine, CH,NH2 dissociates in solution and calculate the pH of a 0.25 M aqueous solution of the substance. Kb for CH,NH, is 1.8 x 10-4 3. Write a balanced equation to show how the following ions hydrolyze in water and write the acid or base dissociation constant for each: b) Al3 d0 HCO a) CN CH,СО, c) CO22 d)

Answer 1

2 Dissociation of CH₃NH₂ is: H2NH₂ + H₂O CH₂ H3 + 8H CH₃NH₂ is acting as a base. polt - 1/2 pkb - / loge -lata exo-07- 4 ogloor) : 2.7 +0.30 - 219 P4 - 4-ео/ 14 - 247 - 11.3 The pнout be 11.3 3 The balanced equations are: as CN & HO - HONT 8H Kb= [Heno CEH [ero] [H20 b Al3+ +6 BH (ALCOH (H2O) + H+ Ko= CALCHO) 5(OH)]2+ (H+ ГАС 10 120 14 со, но — Но, бе we K [HCoo) [8] Гео-г+0) 1 сну co, + H, O — он,со, а да (OHoco (H2 го ген, С) HCO + H₂O = H₂CO3 + 8H Kr. [th Coa] Coltz Снсо Пн, 0) Е,