Question

identify the weakest and strongest acids in the group of three below. the weakest acid is...

identify the weakest and strongest acids in the group of three below. the weakest acid is listed first in the responses. H20, CH4, NH3

a. H2O < NH3   d. CH4 < H2O

b. H2O < CH4 e. NH3 < CH4

c. CH4 < NH3

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Homework Answers

Answer #1

To check for the Strength of the acid, we need to find the Stability of the conjugate base

H2O ----> H+ + OH-

CH4 ----> H+ + CH3-

NH3 ----> H+ + NH2-

OH- is the conjugate base for H2O

CH3- is the conjugate base for CH4

NH2- is the conjugate base for NH3

Out of the three conjugate bases, OH- is the most stable followed by NH2- and CH3- is the least stable based on the electronegativity of O, N and C.

Since the conjugate base of H2O i.e. OH- is most stable, H2O is teh most acidic amongst all.

Conjugate base of CH4 is the least stable. Hence, CH4 is the weakest acid

d) CH4 < H2O

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