Which of the following is the best buffer at neutral pH (pH 7.0)? O Water, pKa = 14 Phosphoric acid, pKa1 = 2.15; pKa2 = 7.2; pKa3 = 12.35 %3D %3D O Carbonic acid, pKa1 = 3.6; pKa2 = 10.3 %3D %3D O Acetic acid, pka = 4.76 The pH of black tea is 5.5, while the pH of Coke is 2.5. Which of the following correctly describes the relative H* concentrations in coffee and Coke? The H concentration of tea is 1000x that of Coke. The Ht concentration of tea is 2.2x that of Coke. The H* concentration of tea is 3x that of Coke. The Ht concentration of Coke is 1000x that of tea.

Which of the following is the best buffer at neutral pH (pH 7.0)? O Water, pKa = 14 Phosphoric acid, pKa1 = 2.15; pKa2 = 7.2; pKa3 = 12.35 %3D %3D O Carbonic acid, pKa1 = 3.6; pKa2 = 10.3 %3D %3D O Acetic acid, pka = 4.76 The pH of black tea is 5.5, while the pH of Coke is 2.5. Which of the following correctly describes the relative H* concentrations in coffee and Coke? The H concentration of tea is 1000x that of Coke. The Ht concentration of tea is 2.2x that of Coke. The H* concentration of tea is 3x that of Coke. The Ht concentration of Coke is 1000x that of tea.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter15: Acid-base Equilibria

Section: Chapter Questions

Problem 20Q: Consider the following two acids: pKa1 = 2.98; pKa2 = 13.40 HO2CCH2CH2CH2CH2CO2H Adipic acid pKa1 =...

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Consider the following two acids: pKa1 = 2.98; pKa2 = 13.40 HO2CCH2CH2CH2CH2CO2H Adipic acid pKa1 = 4.41; pKa2 = 5.28 In two separate experiments the pH was measured during the titration of 5.00 mmol of each acid with 0.200 M NaOH. Each experiment showed only one stoichiometric point when the data were plotted. In one experiment the stoichiometric point was at 25.00 mL added NaOH, and in the other experiment the stoichiometric point was at 50.00 mL NaOH. Explain these results.
Salts containing the phosphate ion are added to municipalwater supplies to prevent the corrosion of lead pipes. (a) Basedon the pKa values for phosphoric acid (pKa1 = 7.5 x 10 - 3,pKa2 = 6.2 x 10 - 8, pKa3 = 4.2 x 10 - 13) what is the Kbvalue for the PO43 - ion? (b) What is the pH of a 1 x 10 -3 M solution of Na3PO4 (you can ignore the formation ofH2PO4- and H3PO4)?
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
What will be the pH of a buffer solution containing an acid with a pKa of 5.4 with an acid concentration equivalent to that of its conjugate base?
Use the following pKa values of phosphoric acid H3PO4: pka1 = 2.15 pka2 = 7.2 pka3 = 12.4 Assume 0.2 mol of Na3PO4 and 0.5 mol of Na2HPO4 are dissolved in 1 Liter of water. Part A. What is the pH of this solution ?
A buffer was created using ascorbic acid and sodium ascorbate. What is the pH of the buffered solution if at equilibrium [H₂C6H6O6] = 5.5 X 10-5 M, [HC6HO6¹¹] = 3.5 X 104 M, and K₂ = 8.00 x 10-5 ? everything is based upon the acid dissolving in water: H₂C6H6O6 + H₂O HC6H6O6¹¹ + H3O+1 [ |][ Ka = [ solve for [H3O+¹] then put in the numbers Ka [ [H3O+¹] = [ [H3O+¹] = pH = -log a. H30+1 b. OH-1 h. HCzH3O2 i. C₂H3O₂-¹ = c. H₂C6H6O6 q. 3 r. 0.5000 s. 5.5 X 10-5 x. 5.5 x 10-² dd. 0.7100 ] y. 0.7000 z. 1.60 x 10-5 ee. 1.26 x 10-5 ff. 4.901 ( d. HC6H606¹¹ j. H₂S k. HS-1 t. 3.5 X 10-4 -1 e. HSO3¹¹ 1. S-² X( m. HX f. SO3² n. X-1 g. H₂SO3 o. 1 p. 2 W. 1.11 x 10-8 u. 8.00 x 10-5 v. 1.75 x 10-6 aa. 1.143 x 105 bb. 0.4900 cc. 1.104 x 10-5 gg. 7.93 hh. 4.942 ii. 4.957
Which of the following is the best buffer at neutral pH (pH 7.0)? a) Acetic acid, pKa = 4.76 b) Carbonic acid, pKa1 = 3.6; pKa2 = 10.3 c) Water, pKa = 14 d) Phosphoric acid, pKa1 = 2.15; pKa2 = 7.2; pKa3 = 12.35
A known organic acid has pKa= 3.80. What is the percent dissociation of this organic acid in a buffer solution at pH=3.0? Show your complete solution.
A weak acid solution with concentration 0.020 M has a pH of 3.7, what is the pKa of this acid?
20. Which of the following acid/ conjugate base pairs would function best as a buffer at physiological pH? a Lactic acid / Lactate ion; pKa = 3.86 b Carbonic acid / Bicarbonate ion; pKa = 6.37 c Bicarbonate ion / Carbonate ion; pKa = 10.25 d Dihydrogen phosphate / Monohydrogen phosphate ion; pKa = 6.86 e Acetic acid / Acetate ion; pKa = 4.76
The pKa values of a compound with two ionizable groups are pK1 =4.10 and pK2 between 7 and 10. A biochemist has 10 mL of a 1.0 M solution of this compound at a pH of 8.00. She adds 10.0 mL of1.00 M HCl, which changes the pH to 3.20. What is pK2? Thank you for your help.
Which of the following acid/ conjugate base pairs would function best as a buffer at physiological pH? Lactic acid / Lactate ion; pka = 3.86 Carbonic acid / Bicarbonate ion; pka = 6.37 Bicarbonate ion / Carbonate ion; pKa = 10.25 Dihydrogen phosphate / Monohydrogen phosphate ion; pKa = 6.86 Acetic acid / Acetate ion; pka = 4.76