Hey guys! Can you please explain each step to the questions that you answer? I a

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Hey guys! Can you please explain each step to the questions that you answer? I am having a little trouble with these questions and having a step by step explanation to the answers and how you got them would REALLY help me out. Also if possible, please write neatly :) I appreciate you guys so much. Thanks for all the hard work you guys put in.

28. 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 0.10 M HBr and 0.10 M KC2H302 C) A solution that is 0.10 M HI 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 29. Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid The acid dissociation constant of nitrous acid is 4.50 x 10- 30. A 100.0 mL sample of 0.18 M HCIO4 is titrated with 0.27 M LiOH. Determine the pH of the solution after the addition of 66.67 mL of LiOH (this is the equivalence point) 31. If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.74, which of the following is TRUE? A) [HCHO21> [NaCHO2] E) It is not possible to make a buffer of this pH from HCHO2 and NaCHO2.

Explanation / Answer

28)
acidic buffer is formed by weak acid and salt of weak acid
basic buffer is formed by weak base and salt of weak base

A forms acidic buffer
B is not a buffer since salt is not of HBr
C is not a buffer since salt is not of HI
D is not a buffer since NaOH and KOH both are strong base

Answer: A

I am allowed to answer only 1 question at a time

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