Question

Which of the following is true about weak bases?

A. They have a low pH.
B. They are often anions of strong acids.
C. They do not react with water.
D. They completely dissociate in solution.

Answer 1

I think C or D.

Answer 2

A strong acid and base are defined as dissociating completely in water.

A weak acid and base are defined as not fully dissociating in water.

Good to know acid and base properties are solvent dependent ( although you probably wont be tested on this fact).

Answer 3

So the answer is C?

Answer 4

Also if you look at a strong Acid:

HNO3 -> H+ + -NO3

-NO3 is a weak base

Also note the stronger the acid the weaker the conjugate base
and
Also note the stronger the base the weaker the conjugate acid

Answer 5

You would call -NO3 a conjugate base of HNO3

Answer 6

The answer is not C because bronsted acid and bases react with water

Here if you want to read more up on this:
http://chemwiki.ucdavis.edu/Physical_Chemistry/Acids_and_Bases/Acid%2F%2FBase_Reactions/Conjugate_Acids-base_Pairs

Answer 7

B?

Answer 8

yup