Questions regarding chemical and lab safety. This includes questions about proper lab procedure, safe chemical handling, and such.

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Percent concentration of 500 μM of H2O2

What is the percent concentration of hydrogen peroxide which has a concentration of $500~\mu\mathrm{M}$? Is $500~\mu\mathrm{M}$ $\ce{H2O2}$ toxic to the eyes? A particular honey has a concentration ...
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1answer
80 views

What are the effects of Lithium Dioxide on the body?

My question is about how much science-fiction and how much chemistry is involved in the the 'Randy's Donuts' scene of Iron Man 2: Agent Romanoff injects Lithium Dioxide into Tony Stark's neck to ...
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1answer
46 views

How to control and vanish termiticide/pesticide fumes from room

I had some wood work done in my room and termiticide (UNIBAN-20 (Chlorpyriphos-20% EC) was used so that there is no termites attack in future. The stupid carpenter was using this product for the first ...
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0answers
5 views

What results from combining monopotassium phosphate, magnesium sulfate and calcium nitrate?

If I mix monopotassium phosphate, magnesium sulfate and calcium nitrate together in aqueous solution, what chemicals will result? Are these safe to combine (i.e. any toxic gasses, etc.)? I thought ...
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1answer
57 views

How do I store HCl safely?

I'm in a textile unit, where we use different chemicals. My question is what type of material should I make my tank out of to store my hydrochloric acid?
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1answer
58 views

Organic Chemistry Hazards

How dangerous is it working with 2-aminobenzimidazole, iminoesters and 1,3,5-triazine? Has there been any cases of health problems recorded concerning those three compounds?
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0answers
38 views

Bromate forming in open water

According to this article, Los Angeles is facing a problem where bromate, a suspected carcinogen, has been forming in their open water supplies. They believe that the formation of bromate has to do ...
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4answers
2k views

Acid Accident Treatment

What are the general ways to treat an accident involving highly concentrated or similarly dangerous acids? I have a lab instructor who is very inexperienced and recently debated with our group about ...
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2answers
72 views

Lithium batteries a reality - why not sodium, pottasium batteries?

Lithium batteries seem to be mainstream now, offering high energy density, high output current capability. Stepping down the periodic table there are alkali metals with greater electronegativity than ...
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1answer
254 views

How to produce dry pure oxygen

I'm supposed to produce dry and pure oxygen using the decomposition of hydrogen peroxide with a manganese dioxide catalyst. $$\ce{2H2O2 (aq) → 2H2O (l) + O2 (g)}$$ The gas will be collected in a ...
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5answers
717 views

How to stop goggles from fogging?

I wear corrective eyeglasses, and because of this, I frequently experience problems with fogging when I wear safety goggles. How can I prevent or reduce fogging? The safety goggles I use are the ...
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1answer
35 views

Reaction between a vinegar/salt/hydrogen peroxide mixture as an etching solution and copper

I am looking for the less harmful chemical solution to serve as an etching solution. After many searches, my interest went to a vinegar/salt/hydrogen peroxide solution. I have to ask then if the ...
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2answers
73 views

Making Liquid CO2

I recently saw a video on making liquid $\ce{CO2}$: https://www.youtube.com/watch?v=8AN_XMcD3yI Basically we seal some dry ice in a container. As the dry ice sublimates the pressure inside the ...
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1answer
337 views

Can ingredients in Tiger Balm cause any harmful effects on PVC figures?

My roommate often uses Tiger Balm and sometimes browses through my collection of vintage Star Wars figures. Can the residue on his fingers cause harm to the PVC figures or cause the paint to crack or ...
2
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1answer
56 views

Bulging Li-ion battery – is it an immediate danger? What’s the likelihood of explosion?

I have a macbook battery that shows as completely dead (doesn’t hold the laptop on even for a second). It now started bulging, and in last week it inflated to about 50 % extra thickness, like this – I ...
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3answers
1k views

How to dispose of pure potassium

I have about 2g of 99.5% Potassium. I want to get rid of it, right now it's in a glass jar sealed. What is the proper protocol? I was going to combust it in water and wash it down the drain but ...
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1answer
389 views

Best Fuel for Potato Gun

I have been using deodorant to propel potatoes (potato gun :D), but I want to switch over to pure butane. However, in order to do this safely I have to know how much butane is typically in deodorant ...
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1answer
148 views

Boiling dish soap

Is it dangerous to boil dish soap (natural, ex: walgreens brand "ology") while also cooking other foods in the kitchen (ex.pasta)? I was trying to clean some pots and read online that a good way to ...
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1answer
132 views

Aluminium and water safety

I have a 8000 gallon water tank that has always had pristine clear water. I have a brass float valve at the top input to the tank. Someone put an aluminum ladder in the tank (15 ft deep tank) and ...
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1answer
35 views

Is pigment grade titanium dioxide likely to contain any impurities that are toxic?

I have a bag of titanium dioxide of pigment quality, unknown source. I am curious to know if the manufacturing process of titanium dioxide makes it likely that it contains any toxic by products / ...
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1answer
39 views

Distillation Heating Mantle Setup

In my lab courses, we were taught to use textbooks off the shelf as elevating props to adjust the heights of heating mantles to the right height during distillations, but I was wondering if there was ...
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2answers
69 views

Are aqueous solutions of oxidizing agents safe?

In the "reducing agent" article in Wikipedia it says Good reducing agents are reagents that deliver $\ce{H2}$. Wouldn't that make water unsafe to dissolve oxidizing agents?
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2answers
151 views

Proper use of vacuum pump during vacuum distillation

I am preparing to do a vacuum distillation and am unsure exactly how to manage the vacuum. The vacuum pump I have is a two-stage rotary vane pump which is capable of 250 microns or lower. It has a ...
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1answer
70 views

how to destroy excess iodomethane in reaction mixture?

I have used iodomethane to make a phenolic $\ce{OH}$ group to $\ce{OMe}$ group in Aq+Methanol medium. I have added water to precipitate the product of mine and will evaporate the solvents but I cant ...
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1answer
61 views

Are there substances people can put on themselves to prevent catching fire?

This can be very useful for people who are afraid of spontaneous human combustion! But seriously, I heard there are non-harmful chemicals used in some fire extinguishers, so can they maybe be put on ...
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1answer
97 views

Separate precious metals from catalytic converter

I am looking to separate the small quantities of platinum and palladium in a catalytic converter. However since these are very inert metals I am unsure how to proceed about doing so. Melting the ...
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1answer
36 views

Capacitance and flammable liquid

I'm trying to attach a sensor to some tubes to measure the level of liquids in them. see here One tube contains toluene and the other contains Recosol R55 (shellite). I'm thinking of using a ...
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1answer
109 views

What would happen if someone consumed a Silica Gel Packet? [closed]

Most packaged goods have the tiny Silica Gel Packets packed along with a clear warning on every single packet. My question is, What exactly would happen if someone actually consumed the contents?
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1answer
35 views

What chemicals would make lime sulfur dip to produce a green colored smoke?

I work at an animal shelter that uses lime sulfur dip to treat ringworm. We had an accident where someone mixed bleach instead of water with the lime sulfur dip which caused us to go through ...
2
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1answer
194 views

Mixing solvents and other compounds - safety issues

I would like to know if it is safe to mix organic solvents together or organic solvents with some compounds listed below. In a mixture with random ratios (greater than zero - all chemicals present) ...
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1answer
48 views

Safe way to extract hydrogen from water through electrolysis [duplicate]

I've done some research on google but most guides I've seen recommend adding salt to the mixture for better conductance which results in release of chlorine. Is there a way to perform electrolysis on ...
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1answer
36 views

What fraction of hydrogen in air results in an explosive mixture?

I would like to know if there is documented evidence of the quantity of hydrogen to air that must be present in the mixture to risk explosion or flame.
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1answer
118 views

Containers to reduce radiation exposure [closed]

A scientist has a sample of uranium-238 (U-238) that is decaying to thorium-234 (Th-234). During the transmutation, a gamma ray is emitted from the nucleus. The thorium-234 daughter particle does not ...
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1answer
82 views

Smoke alarm ion neutralisation

Smoke alarms are a necessary part of many modern day buildings, especially in laboratories and of course, the family home. According to the World Nuclear Association page Smoke Detectors and ...
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1answer
56 views

Can organomercury compounds synthesize accidentally from household cleaning products? [duplicate]

I had broken a CFL partially on carpet last week. It was a spent bulb, and the outer glass shell broke but not the fluorescent tube - apparently the tube did have a small hole in it which found out ...
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1answer
234 views

Why would sulfuric acid turn gray/black?

About 2 years ago I purchased 2 liters of 98% concentrated sulfuric acid. It's in a standard poly bottle with leakproof lids, and originally was clear. Recently I noticed the acids have turned a dark ...
4
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2answers
446 views

Can dimethylmercury originate from cleaning up a broken thermometer with disposable wet wipes?

I broke a CFL in my home (so elemental mercury is present in a small amount) and wiped up some of the mess with a clorox wipe. The wipe in question contains dimethyl benzyl ammonium chloride and ...
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0answers
34 views

Will the sulfur-iodine cycle and Haber Method work at lower pressures and temperatures?

I have a year-long research project next year in my senior year of high school, in which we have to make some product or prototype to solve some issue. My interest was in the Liquid Fluoride ...
4
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2answers
43 views

NaClO Concentration

In my previous occupation the usage of bleach--$NaClO$--I found was quite staggering, and based off of the health issues that I and other coworkers were having, I wanted to see how close we were ...
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1answer
160 views

What reaction is happening when a lithium polymer battery “is on fire”

When something goes wrong with a lithium polymer battery (as are commonly used to power electric models and robots), and it "catches fire", what is actually happening? What gas or gasses are being ...
8
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2answers
220 views

How to store methanol

We will be buying methanol by a about 200 liters at a time, I was wondering what I should consider when storing it. So far I know that it should be in the shade earthed with a copper stake in a ...
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2answers
382 views

Learning about explosives

I was wondering why temperature regulation is an important factor in producing explosives. I know many are exothermic reactions but what would happen if you did not use an ice bath and allow the ...
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1answer
79 views

How it is possible to make Aqua Regia in the lab?

How to make "Aqua Regia" in the lab conditions? Which lab equipment must be used?
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0answers
158 views

how to calculate the gas volume per purge when I change the cylinder?

I have some gas cylinders in a gas cabinet. Every time I change the cylinder, I use N2(100%v/v, 60L/min) to purge the residue gas in the pipe to a local scrubber. I want to know how many gases I ...
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0answers
37 views

Do ethanol and phenylethanol share the same properties?

I was hoping to know whether or not ethanol and phenylethanol share the same properties, i.e. do they both cause intoxication or does the phenyl group change the characteristics of the phenylethanol?
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1answer
99 views

Hydrogenation at atmospheric pressure in amateur environment

I was planning on doing some small scale hydrogenation practicals at atmospheric pressure (probably from Vogel) and ran into a couple of questions. I will be using the "balloon method" (described in ...
2
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0answers
57 views

At what scenario will a LCD monitor that used mercury inside their lamp be harmful

Small amount of mercury and/or mercury vapors is harmful to human as it can cause damage to vital organs such as brain, heart and so on. However, there are many electronic devices such as LCD monitor ...
4
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1answer
141 views

How to remove a stuck stopper from a flask

I had a question about how about how to remove a stopper that has been stuck in the neck of a 100 mL round bottom flask since I forgot to wipe the neck of the flask. A salt was formed in the 100 mL ...
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2answers
157 views

Safety in handling of concentrated ammonium fluoride

I recently saw a protocol for extracting organic materials that are bound in the silica matrix formed by diatoms. The extraction protocol used 10 molar ammonium fluoride ($\ce{NH4F}$). I briefly ...
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1answer
58 views

Could PNP (Silicon) transistor be toxic when exposed to air\light?

The story goes as follow: While I was in the electronic room I got bored and crushed a PNP transistor (Model CDIL 2N2907) using a rotating pipe jaws just like in the picture bellow. Now, it took me ...