Most Popular
1500 questions
15
votes
1 answer
What is the structure of iodide of Millon's base?
In qualitative analysis, $\ce{NH4+}$ ions are confirmed using Nessler's reagent:-
$$\ce{NH4+ + 2[HgI4]^{2−} + 4OH− → HgO·Hg(NH2)I ↓ + 7I^{−} + 3H2O}$$
The brown precipitate formed is called iodide of Millon's base. It is also…
Nilay Ghosh
- 25,509
- 26
- 91
- 197
15
votes
3 answers
Why is the Haber process carried out at such high temperatures?
On a large scale, ammonia is prepared via the Haber process:
$$\ce{N2(g) + 3H2(g)->2NH3(g)} \qquad \Delta _\mathrm{f}H^\circ = -46.1~\mathrm{kJ \cdot mol^{-1}}$$
The optimum conditions for the productions of ammonia are a pressure of…
Tabish Mir
- 1,091
- 1
- 11
- 24
15
votes
1 answer
Why was Lawrencium's symbol changed?
The initial proposal by Lawrence Berkeley National Laboratory scientists for naming element 103 was "Lawrencium" with the symbol "Lw", However, while IUPAC accepted the name "Lawrencium" for the element, it changed the symbol to "Lr".
Was there a…
R.M.
- 4,884
- 1
- 19
- 32
15
votes
1 answer
Do L-sugars (enantiomers of natural sugars) have a sweet taste?
I'm wondering about how L-sugars taste. They are obviously not digestible by humans, but what do they taste like? If they are sweet, too, why isn't sucrose with the unnatural chirality used as a zero-calorie table sugar substitute?
user23965
- 151
- 3
15
votes
4 answers
What is the difference between hand wash and body wash soap?
I do not like body wash always with strong favor. I like hand wash soap to wash my body. Are they difference at all?
Thanks for the comments, so that I add the following information
I am really sorry that I posted the question using my phone at my…
Marco
- 295
- 2
- 3
- 8
15
votes
1 answer
Understanding how mass spectroscopy works
I’m trying to get a deeper understanding of how mass spectroscopy works. Most tutorials and textbooks I’ve encountered omit certain details about the process and I’m hoping someone out there who understands the process can fill in the gaps. I’ll…
Amateur Math Guy
- 395
- 3
- 9
15
votes
2 answers
Does the potential energy increase when temperature is raised?
The potential energy of a material is its ability to do work. So I would suspect the potential energy to increase during phase changes that increase entropy (solid $\rightarrow$ liquid and liquid $\rightarrow$ gas), and decrease in the opposite…
Yoda
- 4,713
- 6
- 30
- 72
15
votes
1 answer
How many basis functions used in STO-3G and 6-31+G** for the water molecule?
I am a little confused about how to decide how many basis functions that are used in a particular basis set for a given molecule.
STO-3G is a so-called "minimal basis set", meaning that only one basis function is used for each atomic orbital in the…
Yoda
- 4,713
- 6
- 30
- 72
15
votes
2 answers
Why is slush hydrogen at the triple point?
Slush hydrogen is a mixture of liquid and solid hydrogen at the triple point considered as a possible vehicle fuel. What is the need of having it at the triple point? Couldn't any other set of thermodynamic conditions consistent with liquid–solid…
F'x
- 23,671
- 8
- 95
- 151
15
votes
1 answer
Mechanism for chloromethylation of benzene with formaldehyde and HCl
What is the mechanism of the above reaction? I have thought of one possibility:
Would this work? How exactly is the chlorine installed on the alkyl chain?
justbehappy
- 1,789
- 2
- 16
- 30
15
votes
3 answers
PV=nRT approximation on other planets?
In Chemistry class yesterday, I learned that real gases with low atomic masses behave like an ideal gas at high temperatures and low pressure. Since on earth at sea level the pressure is close to $1\ \mathrm{atm}$ (which is a low pressure) and…
James Smith
- 321
- 1
- 3
- 8
15
votes
2 answers
What is this Lab equipment?
I want to know the name of this equipment with a sealed graduated tube and the purpose it's being used.
I went through all the results of Google, but I was unable to find this exact equipment. I believe someone here should know this very well.
Nimeshka Srimal
- 391
- 5
- 14
15
votes
2 answers
What causes the "white water" smell?
I can detect a distinct smell when I am near water going over a weir. I could tell that I was near "white water" if I was blindfold. Can anyone tell me what causes this odour?
Helen
- 151
- 2
15
votes
1 answer
Calculating the pH of a highly dilute solution of HCl
For relatively high concentrations of $\ce{HCl}$, I usually just assume that $[\ce{H+}] = [\ce{HCl}]$, because $\ce{HCl}$ is a strong acid and is completely ionized in solution. By taking the negative logarithm of the concentration of $\ce{[H+]}$,…
QCD_IS_GOOD
- 1,118
- 6
- 15
- 27
15
votes
4 answers
Relative strength of desiccants
Is it meaningful to characterize the relative strength of desiccants? For example, is there a measure of hygroscopy, or an ordering of desiccants, such that higher ones will always dry lower ones?
Let us restrict the question to "practical"…
feetwet
- 3,290
- 1
- 27
- 64