Linked Questions

18
votes
3answers
1k views

Is the proton the strongest acid?

Having looked at the various definitions of acids and bases and having refined my understanding of it after learning about the inadequacies of pKa and the novel use of the Hammett acidity function, I ...
15
votes
2answers
14k views

What is the Ka of OH- and Kb of H3O+?

What is the $K_\mathrm{a}$ of $\ce{OH^-}$ and $K_\mathrm{b}$ of $\ce{H_3O^+}$? Have these constants been determined?
14
votes
1answer
10k views

Can H4O 2+ form?

Like $\ce{NH4+}$ ,Is there any possibility of formation of $\ce{H4O^{2+}}$ (of tetrahedral structure)? My theory is: it can be formed by osmosis setup where heavy acids like $\ce{H3PO4}$ or $\ce{...
13
votes
3answers
3k views

pKa differences and reactivity

I know a lot of chemists like to quote $\mathrm{p}K_\mathrm{a}$ values and subtract them to reinforce some notion about some acid-base reaction being highly favorable or highly unfavorable or whatnot. ...
10
votes
1answer
489 views

Do quaternary sulfur dications exist?

We know that sulfur can form sulfides $\ce{R2S}$, with two substituents bonded to it. The simplest example of this would be hydrogen sulfide. However, sulfur can also form sulfonium ions $\ce{R3S+}$,...
1
vote
1answer
274 views

Do amphoteric cations exist?

I know that anions such as $\ce{CH3COO-}, \ce{OH-}, \ce{CN-}$ are basic in nature, since they are conjugate bases of weak acids. Similarly, cations such as $\ce{NH4+}, \ce{H3O+}$ are acidic in nature ,...
0
votes
1answer
271 views

How to find the strongest base using stability arguments

Answers: The most acidic is D and the most basic is A. So first off I compared A with B: I'm kinda confused on this. I looked at the base NH one and saw that when it was protonated it lost its ...
0
votes
1answer
115 views

Reaction between an acid and acid

My initial thought was that the stronger acid will act as an acid and the weaker acid as base like the reaction between $\ce{H2SO4}$ and $\ce{HNO3}$ but in this reaction there is a lone pair available ...
1
vote
1answer
99 views

Is there an example of a bond with negative bond enthalpy? [duplicate]

My textbook says bond breakage is "generally endothermic." This implies there are some bonds out there that release energy when broken. Is there a classic example? Perhaps diatomic Helium?
-2
votes
3answers
67 views

Difficulty in understanding ionisation of sulphuric acid [closed]

$\ce{H2SO4}$ when added to water. $\ce{H2SO4 + 2 H2O -> SO4^2- + 2 H3O+}$ My sir explained me these reaction as $\ce{H}$ will give $\ce{2 H^+}$ ions to the base $\ce{H2O}$.So why does it not become ...