11. Which conjugate base should be the strongest out of these choices? (pKa values of their respective acid is provided) A. NO₂ (3.15) B. CN (9.2) C. NH3(9.26) D. NO3 (-1.5) E. HS (7.04)
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- Which acid listed below is the weakest acid (pKa value is listed for each)? Acid I, pKa = 6.4 2.3 pka = 5.8 Acid III, pK₂ = 4.5 Acid II, pka = Acid IV, Select one: O A. Acid III O B. Acid I O C. Acid IV O D. Acid IISome weak acids and their pKa values are given below. Which one of these acids will have the STRONGEST conjugate base? Select one: a. Phenol; pKa = 10.00 b. Methanoic acid; pKa = 3.75 c. Bromoethanoic acid; pKa = 2.9 d. Methanol; pKa = 15.54Given the following pKa values, which is the strongest base of those listed in the answers? HNO2 (pKa = 3.37) HE (pKa = 3.45) HIO3(pKa-0.77) HBRO (pKa 8.69) HCN (pKa 9.31) A CN OB. 103 Bro D. NO2 E F
- If the concentration of an acid in solution is 2.2 times larger than the concentration of its conjugate base, and the pH of the solution is 3.5, what is the pKa of the acid? Include the answer to 3 significant figures3. Calculate the pH of the following solutions. Hint: some parts should require very little math! a. A 0.010 M solution of an acid that completely dissociates in solution. b. A 0.010 M solution of an acid that's conjugate base has a pk of 8.2. c. A solution that's comprised of 75% acid and 25% conjugate base with a Ka = 1.4 x 10-4 d. A 0.100 M solution of sodium hydroxide.The table below contains the pKa values of four weak acids. Which acid is the weakest? HF 3.14 HNO2 3.39 H2SO3 1.81 H2CO3 6.37
- B) What is the pH at the equivalence point? C) Give the Ka and pKa value of the acid. Explain.Assuming that base (B:) and acid (AH) are mixed in equal concentrațions and using pka values of acid AH 3.7 and pka value of conjugate acid for the base BH 4.9 calculate what percent of BH will appear in this reaction once the equilibrium is reached. Answer is numerical. Round the answer to the nearest whole number. Don't write % symbol in the answer.The following molecule with pKa values shown, is an important antibiotic. At pH =11, which pair of species will be most prominent in solution. Choose the correct pair from those shown in boxes A, B, C and D. (Note: In red, the proton/protons removed/added between the two states is highlighted) + H₂N H₂N A A B с .H pka 10 H₂N + H₂N H₂N B NH ΝΗ N- OH H pka ~5 OH pka ~4 + H₂N HN ho NH + H₂N HN ongs. D O
- The pKa value is ammonia is 9.3. You are allergic to the odor of ammonia. You smelled an ammonia solution with the pH 9.3 yesterday and it was OK. Now you tried to smell the same solution but with the pH of 8.3. What will happen to your allergy symptom? How much better or worse it will be compared to yesterday? (e.g., ~5 times better or worse).Which of the following is true about acids and bases? A. When bases ionize, they donate protons. B. Strong acids and bases are completely ionized in dilute aqueous solutions. C. The dissociation constant of a strong acid is lower than that for a weak acid. D. The pKa of a strong acid will be higher than that for a weak acid.Use a calculator when necessary to answer the following questions. a. What is the pKa for each Ka: 10−10, 10−21, and 5.2 × 10−5? b. What is the Ka for each pKa: 7, 11, and 3.2?