Generally the pH of a buffer is equals to pKa±1, hence if we want to prepare the buffer solution with the given pH, definitely we should choose the pKa that is nearer to the pH.
For the given acids the pKa values are
For HSO3^- , the pKa value is 1.99, hence it is not suitable for preparing of the desired pH solution.
For HOCl the pKa would be 7.53, it is not suitable for the preparing the solution with given pH
For C6H5COOH, the pKa = 4.19, hence it is suitable to prepare a buffer with the pH = 4.5
Which of the following conjugate acid-base pairs should you choose to prepare a buffer solution that...
The substance (CH_3CH_2)_2NH is considered Which one of the following pairs is not a conjugate acid-base pair? A solution is prepared by adding 0.10 mol of sodium fluoride, NaF. to 1.00 L of water. Which statement about the solution is correct? Which, if any, of the following aqueous mixtures would be a buffer system? Which of the following acids should be used to prepare a buffer with a pH of 4.5? Consider the dissolution of MnS in water (K_sp =...
Out of the following , which is the best acid/base to use to prepare a buffer with a PH of 4.00? a. sodium chloride b. sodium pyruvate c. aniline What ratio of masses of the weak acid/base and its conjugate should you use to make the buffer of the required PH? Use the sodium salt of the conjugate base if you chose a weak acid or the chloride salt of the conjugate acid if you chose a weak base.
QUESTION 11 Which of the following acid/base conjugate pairs could you use to make a buffer solution with a pH of 2.10? The Kfor the acids are given in parentheses. Chlorous acid / chlorite (Ka = 1.1 10-2) Benzoic acid / benzoate (K, -6.3 * 10-5) O Hydrofluoric acid / fluoride (Ka = 6.6 x 10-4) Hydrogen phosphate / phosphate (Kg = 4.2 x 10-13) Ammonium / ammonia (K, -5.8 * 10-10)
11. which of the following pairs of species is a conjugate acid-base pair? a. NaF, F b. NHs, NH c. H30+, ОН- d. H2CO3, CO32 8. which of the following salts is most likely to form an aqueous solution having the pH <7? a. NaBr b. LiNO3 c. NH4CI d. RbCN 2. which of the following pairs of species is not a conjugate acid-base pair? a. OH, H b. HOCI, OCh c. HSO4,SO42 d. H2CO3, HCO3
11. which of the...
QUESTION 11 Which of the following acid/base conjugate pairs could you use to make a buffer solution with a pH of 2.10? The K for the acids are given in parentheses. Hydrogen phosphate/phosphate (Kg = 4.2 x 10-13) Ammonium/ammonia (K- 5.8 10-10) Benzoic acid / benzoate (K, -6.3 x 10-5) Chlorous acid / chlorite (K = 1.1x102) Hydrofluoric acid / fluoride (K, = 6.6 x 10-4)
QUESTION 11 Which of the following acid/base conjugate pairs could you use to make a buffer solution with a pH of 3.987 The K, for the acids are given in parentheses. Hydrogen phosphate / phosphate (K, -4.2 x 10-13) Ammonium / ammonia (K, - 5.8 x 10-19 Hydrofluoric acid / fluoride (K. = 6.6 x 10-4) Benzoic acid / benzoate (K, -6.3 * 10-5) Chlorous acid / chlorite (K, -1.1 x 104
QUESTION 11 Which of the following acid/base conjugate pairs could you use to make a buffer solution with a pH of 9.877 The K, for the acids are given in parentheses. Hydrofluoric acid / fluoride (K. = 6.6 x 104) Benzoic acid / benzoate (K, -6.3 x 10-5) Chlorous acid / chlorite (K, - 1.1*102) Hydrogen phosphate/phosphate (K, -4.2 x 10-13) Ammonium / ammonia (K = 5.8 x 10-19
Which of the following pairs does not show an acid and its conjugate base? Select one: a. H2SO4 and HSO4-b. HNO3 and NO3- c. H2SO4 and SO42- d. HSO4- and SO42-
Prepare a buffer by acid-base reactions. Consider how to prepare a buffer solution with pH = 7.35 (using one of the weak acid/conjugate base systems shown here) by combining 1.00 L of a 0.362-M solution of weak acid with 0.325 M potassium hydroxide. pk Weak Acid HNO2 HCIO HCN Conjugate Base NO2 CIO CN K 4.5 x 10-4 3.5 x 10-8 4.0 x 10-10 3.35 7.46 9.40 How many L of the potassium hydroxide solution would have to be added...
A solution contains 19 conjugate acid base pairs. One of these is piperazine and its conjugate acid with a [A-]/[HA] ration of 0.64. What is the pH of the solution? What can you say about the other 18 conjugate pairs?