Which of the following pairs will make a buffer? 1. HCIO4 and NaClO4 4. NH3 and...
5. You need to make 500.0 mL of a buffer with a pH of 2.20. You have the following substances to work with: 0.100 M NH3 Solid NaN3 Solid NaClO2 0.100 M HClO2 Solid NH4Cl Solid Na2SO3 0.100 M HN3 Solid NaHSO3 Ka for HClO2 = 1.1x10-2 Kb for NH3 = 1.8x10-5 Ka for HN3 = 1.9x10-5 Ka1 for H2SO3 = 1.7x10-2 Ka2 for H2SO3 = 6.4x10-8 (Assume that the addition of solid does not change the volume of the...
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...
Please explain. PRACTICE 1: Which one of the following combinations does not create a buffer? a) HC2H302 and K C2H302 b) H2SO3 and NaHSO3 C) H3PO4 and NaH2PO4 d) HNO3 and KNO3 e) NH4Cl and NH3
Which of the following are conjugate acid base pairs? 1. CO2 and HCO, 2. HCIO4 and CIO4 3. H2CO3 and HCO, 2 3
Which of the following combinations would make a buffer with pH close to 3.0? HClO2 Ka = 1.1 × 10-2 NH3 Kb = 1.8 × 10-5 HNO2 Ka = 7.2 × 10-4 C5H5N Kb = 1.5 × 10-9 Equal volumes of 0.10 M NH4Cl and 0.10 M NH3 Equal volumes of 0.10 M HClO2 and 0.10 M NaClO2 Equal volumes of 0.10 M HNO2 and 0.10 M NaNO2 Equal volumes of 0.10 M HCl and 0.10 M NaCl Equal volumes...
Which of the following pairs of chemicals can be used to make a buffer? ONaCN and KCN O NaCN and HCN OHCl and HCN O NaCN and Naci
Question 2 2/2 pts If the pka of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.89, which of the following is TRUE? It is not possible to make a buffer of this pH from HCHO2 and NaCHO2. [HCHO2] = [NaCHO2] [HCHO2] >>[NaCHO2] [HCHO2] < [NaCHO2] [HCHO2] > [NaCHO2] Question 3 1.33/2 pts Acid #1 has a pka of 3.15 Acid #2 has a pka of 3.65 Acid #3 has a pka of 4.23 Acid #4 has...
• Conceptual buffer: • Consider these eight pairs of compounds. Which will make a buffer? Which will not? (Assume about equal amounts of each compound.) HF and F. HF and C. HCl and Cl. NH, and NH,*. H3PO4 and H,PO, H,PO, and HPO42. H2PO, and PO,3. H,Co, and CO22. A student dilutes 50. mL of a phosphoric acid -dihydrogen phosphate buffer solution (initial buffer pH = 1.92) with 50. mL H,O to a final volume of 100. mL. • Will...
Which of following could be used to make a buffer with sulfurous acid, H2SO3? O sulfurous acid cannot make a buffer O sulfate ion hydrogen sulfite (bisulfite) ion O sulfite ion
Which of the following pairs would make a good buffer solution? O H2O, NaCN O HNO3, KNO3 O HCI, NaCl O HF, LIF