Use the following acid ionization constants to identify the correct decreasing order of base strengths for...

Question

Question

Use the following acid ionization constants to identify the correct decreasing order of base strengths for the conjugate bases.

HF: K_a = 7.2 ´ 10^-4

HCN: K_a = 6.2 ´ 10^-10

HNO₂: K_a = 4.5 ´ 10^-4

A. NO₂^- > F^->CN^-

Answer 1

Answer #1

Ka is directional proportional to acidic strength

so Higher the Ka stronger the acid

stronger the acid weaker its conjugate base.

so igher Ka have lower conjugate base strength.

order as follows

answer = option B = CN^- > NO2^- > F^-

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Answer 2

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