acid and base question...?

Question

i was doing my homework and im totally lost...can anyone out there help me out here??

question 1-4refer to the following aqueous solutions.all concentrations are 1M
A. H2C204(oxalic acid) and KHC2O4(potassium hydrogen oxalate)
B.KNO3 AND HNO3
C. NH3 AND NH4NO3
D. C2H5NH2 AND KOH
E. CH3NH2 AND HC2H3O2

1.The most acidic solution:..i thinks its a...but im not sure
2.the solution with the pH nearst7
3 a buffer with a pH>7? I THINK ITS C
4 a buffer with a pH<7?

THANK YOU

Answer 1

1. B. - HNO3 is a strong acid. Remember that organic acids such as oxalic acid will always be weak acids.

2. C. - Weak acid with a weak base will yield a neutral solution

3. D. - Weak acid with a strong base = a buffer>7

4. B. - Weak base with a strong acid = a buffer<7

Answer 2

1) answer B HNO3 is a strong acid and KNO3 is neutral
2) E weak base and weak acid (not sure)
3) C) strong acid and weak base
4)A ) weak acid and strong base

Answer 3

1. a

2. e

3. c

4. a