Consider the Ka values for the following acids:
| Acid | Ka |
|---|---|
| HA | 3.77E-5 |
| HB | 4.65E-6 |
| HC | 6.60E-6 |
| HD | 2.84E-4 |
| HE | 1.45E-5 |
Write the formula for the acid which has the STRONGEST conjugate
base.
What is the corresponding Kb value for the strongest acid from the table above?
Answer:-
The acid which give strongest conjugate base = HB
because it has smallest Ka value because lower the Ka value, weaker is the acid and stronger will be its conjugate base.
strongest acid = HD because it has highest Ka value.
Kb = Kw/Ka
= 1.00E-14/2.84E-4
= 3.52E-11
Consider the Ka values for the following acids: Acid Ka HA 3.77E-5 HB 4.65E-6 HC 6.60E-6...
Consider the Ka values for the following acids: Acid ka HA 4.40E-6 HB 7.01E-6 HC 1.24E-5 HD 3.38E-5 HE 1.25E-5 Write the formula for the acid which has the STRONGEST conjugate base. Submit Answer Tries 0/98 What is the corresponding Kb value for the strongest acid from the table above? Submit Answer Tries 0/98
Given the following acids and their corresponding Ka values, predict which acid would have the strongest conjugate base? a. All will be equally strong. b. HC2H3O2 Ka = 1.8 x 10-5 c. HF Ka = 7.2 x 10-4 d. HOCl Ka = 3.5 x 10-8 e. HNO2 Ka = 4.0 x 10-4
1. Consider three acids: HA with pKa=3, HB with pKa=6, and HC with pKa=9. (a) Which acid is most appropriate for preparing a buffer at pH=4? Explain briefly. (b) You are provided with a 0.1 M solution of HB, a 0.1 M solution of B-, a 1 M solution of HCl, and a 1 M solution of NaOH. Describe (without the amounts) the three ways you could prepare a buffer at pH=6 using mixtures of these solutions? (c) Consider the...
Consider the following unfinished table of weak acids with their corresponding pKa values and Ka values. Weak Acid pka 3.35 ка HNO2 HF HCN - 6.8*10-4 9.31 Arrange these three acids in order of increasing acid strength. (weakest) HCN <HF < HNO2 (strongest) n (weakest) HCN <HNO2 <HF (strongest) (weakest) HF <HNO2 <HCN (strongest) d (weakest) HNO2 <HCN <HF (strongest) Ce (weakest) HNO2 <HF <HCN (strongest)
Given the following acids and their corresponding Ką values, predict which acid would have the strongest conjugate base? O HOCI Ka = 3.5 x 10-8 O HC2H302 Ka = 1.8 x 10-5 O HF Ka = 7.2 x 10-4 O All will be equally strong. HNO2 Ka = 4.0 x 10-4
Rank the following acids in strength (from weakest to strongest). A HC H302 В НОСІ CHCN DHCI weakest = < (Enter the letter corresponding to each acid.) K, for phenol (a weak acid), CH,OH is 1.00×10-10 K, for acetic acid, CH,COOH is 1.80x10-5 K, for acetylsalicylic acid (aspirin), HC,H,O4, is 3.00*10-4 What is the formula for the strongest conjugate base?
3. Consider the following weak acids and their K, values, calculate the pK, for each acid. HC,H,O, - Acetic acid K. = 1.8 x 105 PK,= H,PO, - Phosphoric acid K = 7.1 x 10 PK, HCIO - Hypochlorous acid K = 3.5 x 10 pk = You want to prepare buffers at pH 2.8, 4.5 and 7.5. Which weak acid-conjugate base buffer system is the best choice for each pH from the acids listed? Write the reaction and indicate...
Identify the conjugate acid for the following weak bases and calculate the corresponding Ka-value for each. Which conjugate acid is the strongest? [Hint: See Appendix 5 for the Kb-value for weak bases. Kw = 1.00 × 10–14.] (8.a) CH3NH2 (8.b) HPO42– (8.c) H2NC(O)NH2 (8.d) NO2–
pH of Weak Acids 19. Consider the following acids; CH5COOH ( benzoic acid) Ka = 6.14x10-5 H3BO3 (boric acid) Ka = 5.83x10-10 H2P04 (dihydrogen phosphate) Ka = 6.30x10-8 HNO3 (nitric acid) >>> 1 Put the acids in order from strongest to weakest. 20. Calculate the pH and percent ionization of the following solutions (Use ICE for weak acid calculation) a. 0.15 M HNO3 0.82; 100% b. 0.15 M HNO2 ( ka = 4.5x10-5) 2.59; 1.71%
250. mL of an 8.0 μM solution of the salt of a weak acid (NaD) is added to 250. mL of water. The Ka of the acid HD is 2.5x10-9 . What is the pH of the final solution? Write out a chemical equation: __________ + __________ <-------------> ___________ + ___________ Write out an equilibrium chart: I C E Calculate the pH of this solution once equilibrium has been reached: e. Rank the acids HA, HB, HC, and HD from...