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Electrolysis with salt water on steel plates creates horrible black liquid [duplicate]

We are doing an electrolysis experiment using distilled water with sea salt on clean stainless steel plates. A horrible black gunk has formed in the water, very quickly. What is this? I don't believe ...
• 101
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How do I determine if a nucleophile attacks the electrophilic atom directly or indirectly?

How do I determine if a nucleophile attacks the electrophilic atom directly or indirectly? For instance a nucleophile could attack the carbon in a molecule with a carbonyl directly, but in another ...
13 views

How did Dalton explain the law of multiple proportions?

The law of multiple proportion states the ratio of the masses of the elements in two compounds which the element forms with another element are simple whole numbers. How does Dalton's atomic theory ...
17 views

Peppermint oil and antiseptic mouthwash

Upon mixing peppermint oil and antiseptic mouthwash in a test tube I noticed immediately a white precipitate forms. I attempted to look up why this was except I couldn’t find any information anywhere ...
• 11
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Mechanism of reaction between P4(White phosphorous) and NaOH

P4(white phosphorous) + NaOH ---------> PH3(phosphine gas) + NaH2PO2 I came across this reaction in my chemistry course on Inorganic chemistry. My teacher wrote this reaction on board, I became ...
1 vote
30 views

What is Dornic Acidity and how to measure it?

Context: I work with dairy product (cheese making) and in order to improve the quality of my process, I have documentation (in French) which refers to Dornic Acidity over time. This graph represents ...
• 293
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Etching copper with Sodium persulfate

I would like to know what kind of UV resist ink I will need if I am using sodium per-sulfate as an etch-ant.
59 views

Stereochemistry of nitrosyl chloride addition to an alkene

My book states addition of $\ce{NOCl}$ to propylene results in 2‐chloro‐1‐nitrosopropane: Would it follow syn or anti addition? According to Mallya and Nagendrappa [1], the reaction would follow syn ...
• 53
23 views

Do these nucleophiles favor SN1 or SN2 for a second degree carbon?

I would like to know whether the following species are strong or weak nucleophiles(with the solvent indicated):- Cl- and Br- in polar protic and aprotic solvent RSH/H2S in a polar aprotic solvent ...
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25 views

46 views

Would a 0.3 micron filter be effective in blocking formaldehyde fumes produced by curing cyanoacrylate?

I’m looking into purchasing a mask that blocks particles larger than or equal to 0.3 μm in size. I’m hoping it blocks the formaldehyde fumes produced by curing cyanoacrylate. How effective such mask ...
26 views

Explaining this data and trend? [closed]

This is a graph that's very similar to that of one experiment I'm doing. I was doing a reaction with Aluminum and Copper (II) Chloride, and I got an exponential graph and a logarithmic graph for two ...
34 views

Can shop-bought caustic soda be used to measure titratable acidity of wines?

When making wines, it's occasionally necessary to measure the wine's 'titratable acidity' (TA). To do this, a 0.1N solution of NaOH is titrated with a wine sample. 0.1N NaOH solution can be purchased, ...
• 119
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What is local and global aromaticity?

I was browsing through some research papers, I came across the terms locally and globally aromatic. What does it mean? I was thinking locally aromatic meant it was conjugated in a specific space not ...
35 views

What is the name of this chemical C15H35COOC3H7? [closed]

My friend needs help with his homework and I don't know what is the name of this C15H35COOC3H7. Does it even exist?
21 views

How to convert between mmol/L and mg/L? [duplicate]

(This is not a "homework" question, I am a post doctoral biologist trying to convert data from an old MS to a form that I can use) What is the formula for converting mmol/L to mg/L?
• 85
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Chemistry: The Central Science 14th edition, chapter 3, Design an experiment problem

I am new to chemistry as well as StackExchange network, so any advice is appreciated. I tried to answer it myself, but I am sure it is not completely correct and there are certainly alternative ...
51 views

Can I increase the melting point of paraffin wax over 100 degrees celsius [closed]

Can I increase the melting point of paraffin wax over 100 degrees celsius at room temperature and pressure.
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1 vote
25 views

Understanding Cahn-Hilliard Equation in terms of Units

The Cahn-Hilliard equation may be formulated as $$\frac{\partial c}{\partial t} = M \nabla^2 \left(\frac{\partial \hat f}{\partial c}\right),$$ where $c : \Omega \to [0,1]$ describes the ...
• 43
23 views

Gold or platinum— which one is more reactive? [closed]

Different sources present the reactivity series of metals differently. In some cases, I've seen that they placed gold before platinum. But in some other cases, platinum was placed before gold. So, ...
24 views

Converting mmol/L to mg/L [closed]

Very simple question here, but I am a biologist trying to do some light chemistry... (This is not a "homework" question, I am a post doctoral biologist trying to convert data from an old MS ...
• 85
20 views