Top new questions this week:
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The other day I dumped consumed tea leaves into a brass utensil because I needed the tea-pan urgently. The vessel with the tea leaves didn’t get around for cleaning until the next day. Ergo, the tea …
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From Rojas et al. [1] (emphasis mine): On the other hand, we found that proton exchange with HB occurs in water with the estimated $\mathrm{p}K_\mathrm{a}$ of $3.5\pm 0.2,$ even after reactive sites …
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Background: In order to separate the different phosphorus (P) species in lake or marine sediments, one can use sequential P fractionation method. Its main idea is to use extractants with weak or …
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The book Molecular Quantum Mechanics by Atkins and Friedman [1] says the point group of a harmonic oscillator is $C_\mathrm{s},$ composed by the identity operator $E$ and a reflection $\sigma_\mathrm{…
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I’m looking at Elements of Physical Chemistry by Atkins and de Paula. In section 1A.3, they state Dalton’s law as The pressure exerted by a mixture of perfect gases is the sum of the pressures that …
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I recently came across the Salkowski reaction of cholesterols. Cholesterol in chloroform is treated with concentrated sulfuric acid. A positive test exhibits two distinct layers, the upper chloroform …
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We used benzaldehyde for a demonstration of the Cannizzaro reaction in school, but the liquid we used appeared visibly yellow, as opposed to the colourless liquid described by Wikipedia. A few reasons …
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Greatest hits from previous weeks:
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I know that the lower the pH the faster fermentation occurs. Why does this happen?
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I sort of know how carbonated beverages are carbonated: a lot of $\ce{CO2}$ gets pushed into the liquid, and the container is sealed. There are at least two things I don’t know. First, how much carbon …
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For example, Magnesium has a higher charge density compared to Sodium, therefore its metallic lattice is stronger and it has a higher melting point. Does that mean that Magnesium has more protons and …
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Can someone please explain what exactly the difference between an intermediate and a transition state is? I understand that they are formed as part of the process in converting the reactants to …
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What’s the difference between $\alpha$-D-glucose and $\beta$-D-glucose? Are they isomers? Or do they differ in their elemental composition?
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In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive. This seems reasonable as the anode is the source of electrons and cathode is where the electrons …
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What is the correct way to calculate the concentration $\ce{H3O+}$ in a solution with $\ce{pH}=6.99$? Attempt 1. pH<7, therefore there are only $\ce{H3O+}$ particles in the solution. $[\ce{H3O+…
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Can you answer these questions?
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In histology there are commonly used acidic (= negatively charged) dyes, like eosin, erythrosine, orange G, and basic (= positively charged) dyes, like haematoxylin, toluidine and methylene blue, …
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The MSDS for various glass etching creams all show that they’re primarily composed of 4 substances (the composition percentages vary): Ammonium Bifluoride – 20 – 40% Sodium Bifluoride – 5 – 10% …
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I have to do some tutoring about basic quantum chemistry and the main purpose is to give a deep insight into Hartree-Fock theory. My plan is to start from expressing the many-electron wavefunction as …
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