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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- Calculate the pKa of a acid at 25°C if its conjugate base has a pKb = 1.19Calculate the pH at 25°C of a 0.59M solution of potassium cyanide KCN . Note that hydrocyanic acid HCN is a weak acid with a pKa of 9.21. Round your answer to 1 decimal place.3. Rank the following acids in order from strongest to weakest.HA (pKa = 2.55) H2Z (pKa1 = 4.35) H3X (pKa1 = 3.17) HY (pKa = 5.72) 4. Rank each base in order from strongest to weakest.B (pKb = 4.12) Y– (pKa = 5.72 for conjugate acid) A– (pKa = 2.55 for conjugate acid)E (pKb = 8.12)
- Calculate the pKa value for each of the following acids: Remember to use the rules for significant figures in reporting your answer. a) Phosphoric acid (H3PO4), ??=4.5×10−4Ka=4.5×10−4 pKa = b) Propanoic acid (HC3H5O2), ??=1.3×10−5Ka=1.3×10−5 pKa =1.95 grams of ethanolamine were dissolved in water, and the pH of the solution was adjusted with HCl until 62% of the molecules were in their protonated (conjugate acid) state. The pKa of ethanolaminium (the conjugate acid of ethanolamine) is 9.5. What is the pH of the final solution? Round your answer to one decimal place (e.g., 2.3) using standard rounding conventions for the last digit.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.
- if the pH at one half the first and second equivalence points of a dibasic acid is 4.80 and 7.34, respectively, what are the values for pKa1 and pKa2?Which acid do you think would have the lower pKa value: HBrO4, HBrO3, HBrO2, or HBrO? Explain your answer.Given the Ka values, estimate the pKa value of each of the following acids without using a calculator (that is, is it between 3 and 4, between 9 and 10,and so on?): 1. nitrous acid (HNO2), Ka = 4.0 * 10-4 2. nitric acid (HNO3), Ka = 22 3. bicarbonate (HCO3-), Ka = 6.3 * 10-11 4. hydrogen cyanide (HCN), Ka = 7.9 * 10-10 5. formic acid (HCOOH), Ka = 2.0 * 10-4 6. phosphoric acid (H3PO4), Ka = 2.1
- Put the following bases in order from weakest to strongest and explain why. Cute specific pKa values of conjugate acids to answer this question.The pKa of NH4+ is 9.25. Predict whether the acid form (NH4+) or the base form (NH3) is predominant at pH = 7.4. Explain. Can you help me, please?thank you, I would like to have a follow-up question. Would you get an answer of 4.05 pH if the value of your formic acid is 0.050 M while your sodium formate is 0.10 M? and still the same pKa which is 3.75?