The Ka for the acid, HA, is 0.005. What is the pKb for A-? Which of the followin
ID: 513660 • Letter: T
Question
The Ka for the acid, HA, is 0.005. What is the pKb for A-?
Which of the following will have the highest [H3O+]?
NH4Cl
Which of the following is the strongest base?
F-
C2H3O2-
Cl-
CN-
What is the formula of the salt formed between NH3 and HBr?
NH4Br
NH4Br2
NH4OHBr
NH3Br
What is the pH of a 0.250 M aqueous solution of hydrobromic acid?
What is the pH of a 0.250 M solution of hydrocyanic acid?
What is the pH of a 0.250 M solution of C5H5N?
What is the pH of a 0.250 M solution of NaCl?
What is the pH of a 0.250 M solution of KCN?
Question 12 ptsThe Ka for the acid, HA, is 0.005. What is the pKb for A-?
Which of the following will have the highest [H3O+]?
NH4Cl
Which of the following is the strongest base?
F-
C2H3O2-
Cl-
CN-
What is the formula of the salt formed between NH3 and HBr?
NH4Br
NH4Br2
NH4OHBr
NH3Br
What is the pH of a 0.250 M aqueous solution of hydrobromic acid?
What is the pH of a 0.250 M solution of hydrocyanic acid?
What is the pH of a 0.250 M solution of C5H5N?
What is the pH of a 0.250 M solution of NaCl?
What is the pH of a 0.250 M solution of KCN?
HCNExplanation / Answer
1. pKa = -log Ka = 2.30
pKb of A^- = pKw - pKa = 14-2.3= 11.7
2. HBr is the strongest acid among all the compounds. Thus it will be completely dissociated and will have highest H3O+.
3. conjugate acid of a strong base is a weak acid. Among the four bases C2H3O2^- is the strongest base as its conjugate acid CH3COOH is weakest .
4. Formula of the salt = NH4Br
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