Question

Question 24 (4 points) Which of the following is arranged in order of increasing acid strength? (weakest to strongest) HNO2, HNO3, H20 H20, HNO2, HNO3 HNO3, HNO2, H20 O HNO2, H20, HNO3 HNO3, H20, HNO2

Answer 1

Ang Wets Sheet H2O <HNOZ< HNO3 24. The order of increasing, quid strength from weakest to strongest is Hence, the correct option is © H209 HNO2, HNO3 Exepkination : - Acid is more esthoong cohen its conjugate base is more stable and less strong Now, HNO3 = Hap) * NO3(aq) conjugate base of HNO3 (a fel-fo po O== H (aq) Noz is stabilized through Pesonance. Again, HNOL + No2(aq) Conjugate base ging NE Hence, Noz is less stable than Nos so HNO3 is strong acid than HNO 2 of HNO2 o

Again, H2O Hist ÕH (99) Conjugate base of the It is found that 84 has no resonating structure. So 8t is the least stable. Hence, stability order of conjugate bases 8H < NO2 <Noz Therefore, the order of the cir o acid Strength will be H2O <HNO2 <HNO3 23: C2H202 is a conjugate base of CH402 and Ca Hu Oz or HC2H302 is acetic acid HC2H30267 H traq) + C2H2O2@2) Now, We know, Ka of HC2H302 = 1-8810-5 And for aqueous solution, Kwo of water = 10-14 We have the relation, Kw=ka kb or, K6= Ko Ka 108 *10-5 = 5.56 X10-10 5°56 X 10-10 10-14 Hences / Kb