Tag: acid-base

physical chemistry – What is the pKa of the hydronium, or oxonium, ion (H3O+)?

The Question : 27 people think this question is useful Although the wikipedia page on Hydronium indicates a $\mathrm{p}K_\text{a}$ of −1.74, I noticed in the discussion of this page that the subject seems debated (cf. http://en.wikipedia.org/wiki/Talk:Hydronium#pKa.3F) since alternative (apparently more rigorous) reasoning leads to $\mathrm{p}K_\text{a} = 0$ for $\ce{H3O+}$. Also, many demonstrations lead to $\mathrm{p}K_\text{a}$

safety – Acid Accident Treatment

The Question : 28 people think this question is useful What are the general ways to treat an accident involving highly concentrated or similarly dangerous acids? I have a lab instructor who recently debated with our group about treating an acid spill on the skin. According to him, one should immediately rinse off the acid

What is the strongest acid?

The Question : 29 people think this question is useful According to Wikipedia, $\ce{HeH+}$ and fluoroantimonic acid are the strongest. According to Nature, Carborane acid is the strongest, but Wikipedia says fluoroantimonic acid is stronger. Links: $\ce{HeH+}$ / Wikipedia – stating HeH+ the second most acidic $\ce{HeH+}$ / Wikipedia 2nd source – stating $\ce{HeH+}$ the

acid base – Is methanol more acidic than water?

The Question : 32 people think this question is useful Methanol is slightly more acidic than water. Their $\mathrm{p}K_\mathrm{a}$ values, in water, are $15.5$ and $15.7$, respectively. All other aliphatic alcohols, however, are less acidic than water. Is the following reasoning correct? This is my best rationalization; is there anything better or anything that can

organic chemistry – Acidity of substituted phenols

The Question : 32 people think this question is useful Phenol has a $\mathrm pK_\mathrm a$ approximately equal to $9.9$. When one studies the acidity of chlorophenols, one notices the following: First of all, chlorophenols are more acidic than phenol, due the negative inductive effect (−I) of chlorine, that reduces the negative charge, located on

organic chemistry – Why is pyrimidine less basic than pyridine?

The Question : 35 people think this question is useful From Wikipedia’s article on pyrimidine: Because of the decreased basicity compared to pyridine, electrophilic substitution of pyrimidine is less facile. But why is pyrimidine less basic than pyridine? Pyrimidine has two $\mathrm{sp^2}$-hybridised lone pairs available for protonation, compared with pyridine’s one. The Question Comments :