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7 votes

Compatibility of DCM/CCl3 with sodium hydride

Neither chloroform nor DCM can be used safely with NaH. Chloroform reacts with hydroxide or t-butoxide to form dichlorocarbene, so a much stronger base such as sodium hydride is clearly incompatible. ...
Waylander's user avatar
  • 22.6k
7 votes

Effective pH range in water. What is the definition

In my understanding "the effective pH in water" is nothing else but the Hammett acidity function, which is extension of the classical $\text{pH}$ quantity to non-aqueous solutions. The blue ...
Poutnik's user avatar
  • 42.5k
3 votes

Using ethanol as a solvent of sodium hydroxide?

Ethanol can indeed dissolve sodium hydroxide, although not as effectively as water. Chemists often use potassium hydroxide as a hydroxide base in ethanol solvent. Ethanol has a lower dielectric ...
Oscar Lanzi's user avatar
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3 votes

Using ethanol as a solvent of sodium hydroxide?

Ethanol dissolves $\ce{NaOH}$, at least up to concentrations equal to $10$ grams $\ce{NaOH}$ per litre. At higher concentrations, the following equilibrium starts to become important : $$\ce{NaOH + ...
Maurice's user avatar
  • 29k
3 votes

How to effectively replace DMSO with LC–MS-compatible solvent for the samples from a well plate?

The standard way to remove water and replace with volatile solvents for microscopy is with a dehydration series, e.g., replacing water with ethanol, and then ethanol with acetone. To more thoroughly ...
DrMoishe Pippik's user avatar
3 votes

Williamson Ether synthesis use of particular solvent

The $\text{p}K_a$ of alkyl alcohols* are close to each other; the public compilation by the Bordwell table for example lists MeOH (29.0), EtOH (29.8), iPrOH (30.3). If one assumes the exhaustive ...
Buttonwood's user avatar
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2 votes

Safety of an organic solvent in a sealed pressure pot or vacuum chamber

Trying to dissolve and reuse plastic as a hobby might not be a good idea. There are considerable environmental, as well as safety, concerns. Releasing sizable amounts of organic solvents into the ...
DrMoishe Pippik's user avatar
2 votes

What is the purpose of the reflux ratio for solvent extraction?

In the context of liquid-liquid extraction, reflux may be understood as: "back-recirculation of the scrubbing or stripping solutions" Source: https://www.mdpi.com/2075-163X/13/6/714 So ...
Karsten's user avatar
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1 vote

Bleach turned towel bright pink before fading to white

Possible sunscreen was on the towels? Sunscreen will do that when bleach is added.
Casey Sue's user avatar
1 vote

Explanation for Raoults Law

The lower molar fraction of the volatile liquid A, regardless of if the other component B is volatile or not, means the lower rate of the liquid A evaporation. It can be easily imagined that there is ...
Poutnik's user avatar
  • 42.5k
1 vote

Explanation for Raoults Law

Starting with the easy answer, a solid can attract and absorb a liquid. For example, $\ce{CaCl2}$ is hygroscopic, and is sold packaged to reduce humidity in enclosed locations. Simply think, water ...
DrMoishe Pippik's user avatar

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