Can anybody rank these from most acidic (1) to most basic (14)?

Question

NH4Cl

NaHCO3

KNO3

NH3

H2SO4

HCl

H2SO3

CH3COOH (HAc)

HCN

NaOH

NaCN

NaCH3COO (NaAc)

Na3PO4

Thanks in advance.

To answer the first poster's question: I went to a Catholic high school and received a "C" in Chemistry. I received an "A" in every subject but that one. I see you can't answer it either. LOL Have a great night.

Answer 1

First of all you are providing 13 molecules so we have to rank them from 1 to 13...
The strength of an acid is expressed by its dissociation constant Ka. The stronger it is the higher the Ka. Usually we express them as pKa=-logKa so (because of the -log) th stronger the acid the lower the pKa. Similarly for bases the lower the pKb the stronger the base.
For conjugate acids and bases (an acid dissociates to its conjugate base and H+, and a base turns into its conjugate acid when it receives a H+) pKb=14-pKa at room temperature.

Having said that...

1. HCl pKa= -8.0 is yhe strongest acid
2. H2SO4 pKa1= -3.0 (Has two dissociation constants but we consider the first which is the strongest)
3. H2SO3 pKa1=1.81
4. AcOH (is the proper way to write it) pKa=4.76
5-6 HCN pKa=9.2 and NH4Cl pKa=9.25
NH4+ is the weak conjugate acid of the weak base NH3 so pKa=14-pKb= 14-4.75 =9.25 So actually NH4Cl and HCN are of similar strength.

7. KNO3 it is neutral, because it is the salt of a strong acid and a strong base.

8. AcONa is the conjugate base of AcOH Thus pKb=14-pKa =14-4.75=9.25 From here on we are talking about bases
9-10. NaCN pKb=4.8 and NH3 pKb=4.75.
CN- is the conjugate base of HCN so pKb=14-pKa= 14-9.2=4.8
11. NaHCO3 pKb=14-pKa2=14-10.25= 3.75
12. Na3PO4 pKb=14-pKa3= 14-12.67=1.33
13. NaOH is the only strong base (100%) dissociation

Answer 2

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Answer 3

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