Macmillan Leaming An unknown compound, X, is thought to have a carboxyl group with a pKa of 2.5 and a second ionizable group with a pKa between 5.0 and 8.0. When 50.0 mL of 0.2 M NaOH is added to 75.0 mL of a 0.2 M solution of X at pH 2.5, the pH increases to 7.13. Calculate the pKa of the second ionizable group of X. PK, = 6.83 Incorrect

Macmillan Leaming An unknown compound, X, is thought to have a carboxyl group with a pKa of 2.5 and a second ionizable group with a pKa between 5.0 and 8.0. When 50.0 mL of 0.2 M NaOH is added to 75.0 mL of a 0.2 M solution of X at pH 2.5, the pH increases to 7.13. Calculate the pKa of the second ionizable group of X. PK, = 6.83 Incorrect

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter20: Carboxylic Acids And Nitriles

Section20.3: Biological Acids And The Henderson–hasselbalch Equation

Problem 5P: Calculate the percentages of dissociated and undissociated forms present in the following solutions:...

See similar textbooks

Similar questions

An unknown compound, X, is thought to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 and 8. When 75 mL of0.1 M NaOH is added to 100 mL of a 0.1 M solution of X at pH 2.0, the pH increases to 6.72. Calculate the pKa of the second ionizable group of X
An unknown compound, X, is thought to have a carboxyl group with a pK, of 2.5 and a second ionizable group with a pk₁ between 5.0 and 8.0. When 50.0 mL of 0.2 M NaOH is added to 75.0 mL of a 0.2 M solution of X at pH 2.5, the pH increases to 7.13. Calculate the pK, of the second ionizable group of X. pK₂ =
An unknown compound, X, is thought to have a carboxyl group with a pK₂ of 2.5 and a second ionizable group with a pKa between 5.0 and 8.0. When 50.0 mL of 0.2 M NaOH is added to 75.0 mL of a 0.2 M solution of X at pH 2.5, the pH increases to 7.13. Calculate the pK₂ of the second ionizable group of X. pK₂ = 6.97 Incorrect
Write the values of Y and X. H2SO4 CH3CH=CH2 + H2O CH;CH-CH2 H HỌ 2-propanol an alcohol The pKa of a protonated alcohol is about -2.5, and the pKa of an alcohol is about 15. Therefore, as long as the pH of the solution is greater than Y and less than X, more than 50% of 2-propanol will be in its neutral, nonprotonated form. Express your answers using two significant figures separated by a comma. AX中 Y, X = %3|
An unknown compound, X, is thought to have a carboxyl group with a pKa of 2.0 and another ionizable group with a pKa between 5 and 8. When 75 mL of 0.1 M NaOH is added to 100 mL of a 0.1M solution of X at pH 2.0, the pH increases to 6.72. Calculate the pKa of the second ionizable group of X. PLEASE SHOW FULL PROCEDURE AND BE CLEAR AND EXPLICIT IN EACH OF THE CALCULATIONS
Give typed solution A compound has two carboxyls and one aminium group. The pKas of the groups are 2.1, 4.5, and 9.1, respectively. A biochemist has 100 mL of a 0.10 M solution of this compound at a pH of 5.2. She adds 29 mL of 0.1 M NaOH. To the nearest hundredth of a unit, what will be the pH of the solution after addition of the NaOH? (Assume full stirring to reach a new equilibrium.) (ANSWER IS 8.25, BUT UNSURE HOW TO GET THERE)
What will be the appropriate pH of a buffer prepared by mixing 100 ml of 0.1 M Na2HPO4 and 100 ml of 0.1 M NaH2PO4? (For H3PO4, pKa1 = 2.1; pKa2 = 6.8; pKa3 = 12.5) Ans in 2 significant figures
How many grams of dipotassium succinate trihydrate (K2C4H4O4-3H,O, MW = 248.32 g/mol) must be added to 610.0 mL of a 0.0587 M succinic acid solution to produce a pH of 5.835? Succinic acid has pKa values of 4.207 (pKal) and 5.636 (pK42). mass: g
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?
I need help with this problem. Compare the pH of propionic acid and nitric acid when they are dissolved in water at a concentration of 20 mM using the "Arrhenius Concept". Include:a balanced equation describing the acid-base reactions involvedThe calculation of the pKa for bothThe calculation of the two pH's (of propionic acid and nitric acid when they are dissolved in water at a concentration of 20 mM)and A calculation of the percent of dissociation of both propionic acid and nitric acid.The gibbs free energy ΔG are listed as the following:Nitric acid: -152 kJ/molPropionic Acid : -291 kJ/molPropionate: -361 kJ/mol
Chemistry PLEASE HELP ILL GIVE LIKES/THUMBS UP!!! 33. An unknown compound, X, is known to possess two groups that ionize as the pH changes. One of these groups is a carboxylate with a pKa of 2.0. When 80 ml. of 0.1 M NaOH is added to 100 ml. of 0.1 M solution of X at pH 2,6, the pH increases to 6.72. What is the pKa of the second ionizable group of X? A. 6.12 B. 6.54 C. 7.32 D. 6.90 E. 6.72
ANSWER THE FOLLOWING WITH A COMPLETE SOLUTION. Compute for the pKa of benzoic acid (Ka = 6.3 × 10-5). What is the Kb of ammonia if its pKb is 4.75? What is the [OH-] of a solution if its pH is 5.69? Identify the [H+] of a solution with a pOH of 11.41. Identify if it is neutral, acidic or basic. What is the pH of a buffer prepared with 0.51 M disodium phosphate and 1.1 M sodium acid phosphate? (pKa of sodium acid phosphate = 7.21) Compute the pH of a buffer containing 0.62 M boric acid (Ka = 5.90 × 10-10) and 0.45 M sodium borate.