Problem #1: Calculate the percent dissociation of a weak acid in a 0.050 M HA solution. What is the Ka for hydrazoic acid? asked by Omi on August 1, 2013; Chemistry. Use the method of successive approximations. Calculate the Ka for hydrazoic acid. I need help i do not know how to do this problem at all. Just comment below. The Ka of hydrazoic acid is … … Return to a listing of many types of acid base problems and their solutions. Use the successive approximations approach to solve for [H ] Answer Save. HAsO 4 2– 3.2×10 –12. Start with the dissociation equation, HA <=> [H+][A-], meaning that Ka = [H+][A-]/[HA]. Heavy metal azides, which are salts of hydrazoic acid, HN3, are used as explosive detonators. but [H ] should no equal to 2.78*10^-4 M. Hint: you have assumed that the change in acid concentration is not significant. Calculate the pH of 500ml of 1M hydrazoic acid. Ka=2.5x10^-5? 3 Answers. What is the pH after 13.3 mL of base is added? Answer to: The Ka of hydrazoic acid (HN3) is 1.9 x 10-5 at 25.0 C. What is the pH of a 0.40 M aqueous solution of HN3? A 30 ml sample of of 0.150 m hydrazoic acid (ka = 4.50x10^-4 ) is titrated with a 0.100 m NaOH what is the ph after the ff additions of NaOH 30ml 45ml 60ml . A 25.0-mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. A 30.00 mL sample of 0.1500 M hydroazoic acid (HN3; Ka = 1.9 x 10-5) is titrated with 0.1000 M KOH. A 100 mL sample of hydrazoic acid, HN3(aq) with a concentration of 0.25 mol/L has a pH of 2.78. Relevance. DeWayne D. Anderson. Acid Ionization Constants at 25 °C. A solution of 0.10 M hydrazoic acid has a pH of 3.36. If we have 1 molar hydrazoic acid, then how much will dissociate? Acid Formula K a. Acetic acid HC 2 H 3 O 2 1.8×10 –5 Acrylic acid HC 3 H 3 O 2 5.5×10 –5 Aluminum 3+ ion Al 3+ (aq) 1.4×10 –5 Ammonium ion NH 4 + 5.6×10 –10 Anilinium ion C 6 H 5 NH 3 + 1.4×10 –5 Arsenic acid H 3 AsO 4 6.0×10 –3 H 2 AsO 4 – 1.0×10 –7. Return to the Acid Base menu. Keep in mind that the Ka of hydrazoic acid is 2.2 × 10-5. Update: PH = 3.56 . Calculating the pH isn't too tough, and I'm happy to help with any questions you may have. PLZ answer this question.