[orgostudent]

can anyone tell me--which order do these go in (from least to most)

H2O
HBr
NH3
NH2-
(CH3)3COH
CH3C(=O)OH
CH3CH2CH3

[macman104]

Please give us your attempt.  If you can include your reasoning, it will help in responding to your question, as we can see what things are causing difficulty.  To get started, think about the nature of the bonds (ionic or covalent), resonance, and inductive effects (how do the neighboring atoms stabilize the charge)

[peachygirl4444]

Pka?

[vhpk]

can anyone tell me--which order do these go in (from least to most)

H2O
HBr
NH3
NH2-
(CH3)3COH
CH3C(=O)OH
CH3CH2CH3

Yeah, you needn't pKa because you explain this in qualitative way.
First, acidic group: HBr, (CH3)3OH, CH3COOH.
HBr is the most, because of the large size of bromine atom -> polarize the bond H-Br -> H easily separate to form H+. Write the formulae of MeCOOH and t-BuOH, you will see the C=O group is polarized to O -> polarizing O-H group while t-BuOH only has t-Bu group.
Basic group: NH3, NH2-
NH2- is stronger because there is 1 negative charge in its molecule while NH3 doesn't.
H2O is intermediate.
CH3CH2CH3 doesn't have either acidic or basic properties

[lutesium]

NH2- is a stronger base due to its negative charge which makes it a stronger proton acceptor (basicity charachter).


Lutesium...

[lutesium]

VHKP I think that you made a mistake while telling the order because the order should be like this:

Acidity in descending order
HBr > CH3COOH > t-BuOH> H2O> NH3 > NH2-
Hydrocarbons have no acidity or basicity charachter.


Lutesium...