7 votes

Mechanism of the blue bottle experiment

Bassam Shakhashiri's book entitled "Chemical Demonstrations, A Handbook for Teachers of Chemistry" gives a detailed study of the mechanism of the blue bottle, in his Volume $2$, page $145$ ($...
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6 votes

Mechanism of the blue bottle experiment

According to Shakhashiri and coworker's 2012 J. Chem. Ed. paper, the linear form of glucose forms an endiolate which gets oxidized to a dicarbonyl (on carbon 1 and 2) and then further reacts with the ...
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5 votes

What drives double displacement reactions?

Dissolved salts exist as separated, hydrated ions, moving and reacting independently. (*) Like for $\ce{Zn}$ and $\ce{CuSO4}$: The reaction is $\ce{Zn(s) + Cu^2+(aq) -> Zn^2+(aq) + Cu(s)}$. The ...
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4 votes

How specific is the exception of negative charge location (orbital vs atom) for determining stability of conjugate base?

The enhanced electronegativity that comes from having carbon with $\mathrm{sp}$-hybridized orbitals is enough to allow terminal acetylenes to protonate nitrogen-anion bases like $\ce{NH2^-}$, but (in ...
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2 votes

Why is there an increase in the pH at the start of a titration between a weak acid and a strong base?

Whenever the addition of small amounts of strong base changes the ratio of weak acid to weak conjugate bases a lot, the slope will be high. This is the case at the beginning (when the concentration of ...
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1 vote

Why did neutralization of weak acid calculation differ from empirical results?

No need to use dissociation constants. $\pu{1 mL}$ of $\ce{0.33 M}$ acetic acid contains $\ce{3.3 10^{-4} mol}$ acid. To neutralize this acid, $\ce{3.3 10^{-4} mol NaOH}$ is needed, which is included ...
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1 vote
Accepted

Question about aluminium and complex ion formation in water vs in acid

Metallic aluminum is not charged. It has to loose three electrons in order to make the ion $\ce{Al^{3+}}$, which can be complexed later on. An acidic solution is a good way for helping $\ce{Al}$ to ...
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1 vote

Does the nature of the H-A bond tell us about the $\Delta$G of an acid's dissociation?

This is a good question, and Ill try my best! The acidity of an acid is solely dependent on the nature of the HA bond. When learning about acidity and basicity, the concept of conjugate base stability ...
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