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18 Nov 2019
20) Identify a good buffer. A) small amounts of both a weak acid and its conjugate base B) significant amounts of both a strong acid and a strong base C) small amounts of both a strong acid and a strong base D) significant amounts of both a weak acid and a strong acid E) significant amounts of both a weak acid and its conjugate base 21) Which of the following solutions is a good buffer system? A) A solution that is 0.10 M HC2H302 and 0.10 M LiC2H302 B) A solution that is 0.10M HF and 0.10 M NaC2H302 C) A solution that is 0.10 M HCI and 0.10 M NH4 D) A solution that is 0.10 M NaOH and 0.10 M KOH E) None of the above are buffer systems. 22) If the pka of HCHO2 is 3,74 and the plt of am HICHo/NaCH02 solaton is 311, which of the floving is TRUE? E) It is not possible to make a buffer of this pll from HCH02 and NaCHO2 23) Calculate the p/H of a buffer that is 0.020 M HF and 0.040 M LiF. The Ka for HF is 35 x 104, A) 2.06 B) 4.86 C) 3.16 D) 3.46 E) 3.76 24) Calculate the phl of a solution formed by mixing 100.0 mL of 020 M HCI0 with 200.0 mL of 0.30 M KCIO. The Ka for HCIO is 2.9 x 10-8 A) 5.99 B) 8.01 C) 7.54 D) 7.06 E) 6.46 25) A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in LiF. Calculate the pH of the solution after the addition of 0. 150 moles of solid LiOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 104 A) 3.46 B) 4.06 C) 2.85 D) 3.63 E) 4.24
20) Identify a good buffer. A) small amounts of both a weak acid and its conjugate base B) significant amounts of both a strong acid and a strong base C) small amounts of both a strong acid and a strong base D) significant amounts of both a weak acid and a strong acid E) significant amounts of both a weak acid and its conjugate base 21) Which of the following solutions is a good buffer system? A) A solution that is 0.10 M HC2H302 and 0.10 M LiC2H302 B) A solution that is 0.10M HF and 0.10 M NaC2H302 C) A solution that is 0.10 M HCI and 0.10 M NH4 D) A solution that is 0.10 M NaOH and 0.10 M KOH E) None of the above are buffer systems. 22) If the pka of HCHO2 is 3,74 and the plt of am HICHo/NaCH02 solaton is 311, which of the floving is TRUE? E) It is not possible to make a buffer of this pll from HCH02 and NaCHO2 23) Calculate the p/H of a buffer that is 0.020 M HF and 0.040 M LiF. The Ka for HF is 35 x 104, A) 2.06 B) 4.86 C) 3.16 D) 3.46 E) 3.76 24) Calculate the phl of a solution formed by mixing 100.0 mL of 020 M HCI0 with 200.0 mL of 0.30 M KCIO. The Ka for HCIO is 2.9 x 10-8 A) 5.99 B) 8.01 C) 7.54 D) 7.06 E) 6.46 25) A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in LiF. Calculate the pH of the solution after the addition of 0. 150 moles of solid LiOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 104 A) 3.46 B) 4.06 C) 2.85 D) 3.63 E) 4.24
Deanna HettingerLv2
10 Oct 2019