Question 6 5 pts Which buffer system is the best choice to make a buffer at...
32. Which buffer system is the best choice to create a buffer with pH =9.00? For the best system, calculate the ratio of the masses of the buffer components required to make the butffer HNO/KNO HF/KF NH3/NH CI HСО /КСЮ
QUESTION 5 Which pair listed below could be used to make a buffer solution? O HCIO and CIO O HCIO and CN O HCIO and HCIO2 OHS and CN OHS and Br O cioand cr
Part A Which of the following buffer systems would be the best choice to create a buffer with pH = 9.00? OHF/KF O HNO2/KNO2 O NH/NHCl OHCIO/KCIO Submit Request Answer
Which of the following substances will be best for preparing a buffer solution with a pH=7.4 Acid HCIO 2.9 x 10-8 H2CO3 4.4 x 10-7 HNO2 7.4 x 10-4 NH4 5.8 x 10-10 HCIO HNO2 NH4 O H₂CO₃
2 points QUESTION 4 Which of the folowing will be the best conjugate acid/base pair to prepare a buffer at a pH of 3.25? The ka for the acid is provided in parentheses. O HNO2INO2 (40 x 10-4) HC2H302/C2H302 (1.8 x 10-6 Онсисі HCO3 C022 (4.8 x 10-11)
Question 14 3 pts Which of the following pairs would be appropriate to make a buffer of PH 2.0? O HNO2 and KNO2 O NaHSO4 and H2SO4 Na2SO3 and NaHSO3 Na2HPO4 and Na3PO4 O H2C204 and NaHC204 3 pts Question 15 Which of the following pairs will make a buffer? Question 3 3 pts What is the solubility of SrF2 (s) in moles per liter (mol/L) in pure water? O 3.7 x 10-5 O 5.3 x 105 O 2.8 x...
4. Which combination of acid and base would you use to make a buffer system that has a pH of 7.72 (5pts) Show sample work. Acid Conjugate Base H SO H SO: HOHO, HF HCIO CIO C. HOH CHO Ka 1.5x102 2.4x10-12 3.5x10-4 3.0x10- 1.3x10-10
Which of these solutions would be the best choice for a pH 11.00 buffer? Ka Acid HA HB 7.59 x 10-4 1.26 x 10-6 7.94 x 10-9 1.32 x 10-11 HC HD O 1.0 MHC and 1.0 M NaC They are all equally good 1.0 M HD and 1.0 M NaD O 1.0 MHA and 1.0 M NaA 1.0 MHB and 1.0 M NaB
23. Acid Structure 0 HNO 4.0 x104 CH 1.3 x10-5 Cl HCIO 3.0 x 103 0 HoCH 1.6 x10-10 The table above shows the values of Ka for four weak acids. Which of the following pairs of chemical species, when combined in equimolar amounts, results in a buffer with a pH closest to 4.8? (A) HNO2 and OH- (B) HC3HsO2 and C3HsO2 (C) HCIO and CIO (D) C6HsOH and C6HsO
Question 6 4 pts Consider the reaction HC2H302(aq) + H2O(0) ---> H30"aq) + C2H302 (aq). Which species is the conjugate acid? OC₂H₂O₂ ОН,0° 8 H₂O O two of these OHC2H302