February 21, 2017

Homework Help: Chemistry(Please check)

Posted by Hannah on Saturday, March 24, 2012 at 5:48pm.

1) Which statement below is correct (true)?

a) Since HNO2 is a stronger acid than HF it must have a greater pKa.
b) Since HOCℓ is a stronger acid than HCN, then OCℓ– is a stronger base than CN–.
c) The dissociation (or ionization) of HOCℓ in water is HOCℓ + H2O º HCℓ + 2OH–.
d) The pH of a 0.10 M solution of acetic acid (Ka = 1.8 x 10-5) will be higher than the pH of a 0.10 M solution of formic acid (Ka = 1.8 x 10-4).
e) If the Kb for CH3NH2 is 5.0 x 10-4, the Ka for CH3NH3+ is 2.0 x 10-5.

My answer is that the pH of acetic acid will be higher than formic acid.

2)Which of the following is a Bronsted-Lowry base but not a Lewis base?

H2O, CN^-^, HSO4^-^, NH3, all choices are both B/L and Lewis base.

I know that H2O and NH3 are lewis base but I am not sure about CN^-^ and CO3^2-^. I think that CO3^2-^ is the answer that is not a lewis base.

Would you agree with my answers? Thank you for checking my answers.

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