New answers tagged experimental-chemistry
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Is bad to inhale the fumes of ammonia?
Ammonia is a colorless highly irritating gas with a sharp suffocating odor. According to New York State Department of Health:
Ammonia is corrosive. The severity of health effects depends on the route ...
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What is laboratory air?
Laboratory air is not a designated or special term. All it conveys to the experimentalist is that literally "laboratory" air was used for oxidation. This is perhaps a handwaving way of ...
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Why potassium carbonate breaks glass when heated?
If the beakers are not made of borosilicate glass, it will react with the metal carbonate and break the glassware:
Fusion with an alkali metal carbonate, usually anhydrous sodium or potassium ...
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In JJ thomson's cathode ray experiment why is the effect of gravity on the electron not considered?
Various versions of Thomson's original article (Philosophical Magazine, 44, 293-316 (1897)) can be accessed freely online, for instance at Google books, or here (link liable to rot).
But you can work ...
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Tollen's Test - Clean Up
This answer will focus on the equations involved in the reactions of the questions. For the explanation please refer anon's answer.
Equations:
Tollen's test of formaldehyde (works same for glucose, ...
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Tollen's Test - Clean Up
This mixture, often called "chromic acid," is a common way to clean glassware. It is a strongly oxidizing acid which reacts with most organic material, so it is able to remove most types of ...
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why are there no pictures or experiments on solid ozone?
The color of liquid ozone is documented in sciencemadness.org:
Liquid diatomic oxygen, for comparison:
The color difference is similar to what we see between aquo and ammine complexes of copper, and ...
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What's the practical use-cases of Raoult's Law?
I can think of one right away, that is estimating molecular masses of solutes. Further, making fractional distillation requires mole fractions in the gas phase to be different those in the solution ...
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Soil chemical Anaylsis/CAL-P
The first sample of soil has $6.57$mg $\ce{P2O5}$ in $100$ mg soil, or $65.7$ mg $\ce{P2O5}$ in $1$ kg soil. As $\ce{P2O5}$ contains $43.6$ % P, the soil contains $0.436 · 65.7$ mg P = $28.5$ mg P in $...
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Understanding Rossini and Frandsen experiment for measuring $(\partial u/\partial P)_T$?
One form of the general virial equation of state for a real gas is $$\frac{Pv}{RT}=1+B^*(T)P+C^*(T)P^2+...$$where v is the molar volume. At low pressures, this approaches $$\frac{Pv}{RT}=1+B^*(T)P$$
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using either 2-propanol or isopropyl alcohol for writing a report
Many compounds can have more than one systematic IUPAC name. A compound may be named correctly in two or more ways in accordance with the several methods recommended by IUPAC.
However, “isopropanol” ...
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What does it mean if a calibration curve regression doesn't cross (0,0)
I saw a couple of reports about how forcing it was bad but I was
just wondering if there was any other explanation for why my
absorbance might be so high.
You are doing emission spectroscopy (AES= ...
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Accepted
Storage of air and temperature sensitive reagents
Your question can not be easily answered. The only valid reply must be: It really depends on the individual case and the reactivity as well as physical properties.
Is your compound easy to evaporate? ...
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Storage of air and temperature sensitive reagents
To store air-sensitive and temperature-sensitive reagents:
Air-Sensitive Reagents:
Use air-tight containers.
Inert gas can help displace air.
Store in a cool, dry, dark place.
Temperature-Sensitive ...
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Storage of air and temperature sensitive reagents
Three thoughts:
As soon as you pierce the septum, it is perforated. Depending on what you aim to store in the bottle, the material of the septum and its age (not age, but what happened to the septum [...
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