Questions tagged [safety]

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

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9
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2answers
14k views

How does sulfuric acid react to heating?

How would $\ce{H2SO4}$ react to heat ? I assume that it would form toxic sulfur (di/tri)oxide, but I can't find any information on this. I'm concerned about fire hazards specifically, so assume very ...
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1answer
93 views

Shouldn't MSDS data on products be publicly disclosed?

I am wondering whether companies are required to disclose MSDS data on their products: toxicity, $\mathrm{LD_{50}}$, etc. Not only that, but I am wondering whether they are required to disclose the ...
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2answers
3k views

Why can't sodium salts be produced through a reaction between a metal and an acid?

I am writing a lab report for the preparation of sodium sulfate crystals. This question came up: Why can the reaction between a metal and an acid not be used to make sodium salts? In this case, could ...
20
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1answer
11k views

Brown stains on skin after working with Tollens' reagent

I was working in the lab preparing Tollens’ reagent. When I came back home, I observed that my fingertips were brown, and I tried to wash it with soap several times but it didn't work. It has been a ...
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0answers
23 views

bio-compatible thermoset resin

I am looking for something rather odd and specific. I need a chemical resin that is liquid up to 250 deg. F, Is a thermoset (it cures at temperatures above 250 F), and is biocompatible in that if ...
3
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2answers
1k views

Metal rod and NMR machine [closed]

I have a metal rod in my leg from previous surgery. I believe it is titanium. Would this significantly affect/be affected by an nmr machine? I noticed that a sign by it said not to bring metal objects ...
6
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1answer
1k views

What makes formaldehyde 'safe' or 'dangerous'?

I know that formaldehyde naturally occurs as a metabolite and can be found in our own and other animals' bodies, plants, and unprocessed food. But formaldehyde is also registered as a carcinogenic ...
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1answer
6k views

Why is chloroform kept in dark coloured bottles?

Why is chloroform ($\ce{CHCl3}$) kept in dark coloured bottles?
3
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1answer
503 views

Reactivity and transport safety of substituted methyl benzoates

This was a practice question from an MCAT book whose answer I didn't really understand: The normal reactivity of methyl benzoate is affected by the presence of certain substituents. Which of the ...
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0answers
109 views

What are APG and AEO7 and should I be concerned?

I'm considering importing some granite cleaner for my stone business to save some money and the following is the list of ingredients: APG, AEO7, silicone oil, water, White Mineral Oil My question ...
4
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1answer
1k views

Are there any common and identifiable hazards to being a Chemistry Teacher? [closed]

I'm a High School Chemistry teacher. I have only been teaching for a few years and know very few other chemistry teachers. Of the ones I do, One has died of cancer, one is a cancer survivor and one is ...
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1answer
51 views

Carbon monoxide formation in broken boilers

It's common knowledge, that if you're boiler is broken, it might produce carbon monoxide ($\ce{CO}$) as a byproduct, which is very toxic, even in small quantities. My question is, why do broken ...
6
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1answer
520 views

Lysol and bleach

I mixed Lysol with bleach and observed that the container became very hot. What reaction occurs between Lysol and bleach, and could it be dangerous or explosive?
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3answers
2k views

Is cobalt (II) chloride in silica gel dangerous when heated?

Today I decided to reheat 3 x 40 gram silica gel canisters with the blue/pink silica gel for the first time, and after I decided to order some more. While shopping, I noticed people say how it is a ...
2
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1answer
157 views

Is there safe chemicals for making voice pitch or bass?

I'm looking for safe experiment that can pitch and bass my voice.finally I find a video that do it but he said "not try in home,ok..?".Is there safe tool or chemicals for Manipulation of the larynx is ...
7
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0answers
84 views

Can sunlight and its heat create a caustic or toxic substance from coconut oil on human skin? [closed]

I heard that story quite often, if it's true, how does it work? Notice that I’m not talking about using coconut oil as a sunscreen (it’s another topic) but about the action of the sun on the oil and ...
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2answers
2k views

Under which criteria HNO3 is a concentrated or a diluted acid? [closed]

I would like to buy nitric acid to remove impurities of copper on an aluminum plate. I read that a 10% nitric acid will do the job. However I've also read that concentrated nitric acid is very ...
2
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1answer
214 views

Is it safe to use lab-grade calcium nitrate as a fertilizer?

I want to use lab-grade calcium nitrate in my hydroponic system (as a fertilizer) to grow lettuce, is it safe?
2
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2answers
5k views

Reaction between lye and water?

I am planning on making some homemade soap soon and have read online that breathing in the fume generated from the reaction between lye and water is not recommended because it is "hazardous." I am a ...
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1answer
203 views

Would consuming the Belousov-Zhabotinsky reaction be dangerous? [closed]

I'm wondering if the chemicals involved in the Belousov-Zhabotinsky reaction would be at all poisonous. If at all, do you know of another similar oscillating reaction that could safely be ingested? [...
-1
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1answer
85 views

Homemade insecticide, is it safe or will a harmful chemical reaction occur? [closed]

I live just outside of Tucson Arizona and there are a lot of venomous spiders, scorpions and other potentially harmful critters. I have 2 retrievers, 2 cats and 4 turtles and would like to avoid ...
2
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1answer
656 views

Mixing Oxalic acid and glycerin

I am doing an experiment for a miticide for honey bees. I will be dissolving 600 g of 99.6 % oxalic acid in one liter vegetable glycerin at 150 °F. I have been told it will give off formic acid fumes ...
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1answer
937 views

Sodium fluoride and varying pH - HF risk [closed]

I'm looking into conducting an experiment on the adsorption of fluoride (for my International Baccalaureate Extended Essay). As I will be investigating the role of $\mathrm{pH}$ in adsorption capacity,...
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1answer
511 views

Is there powdered blood in TANG-pineapple powdered juice mix? [closed]

My TANG pineapple juice drink mix is a yellow powder. When I add a little water to it, it dissolves and red dots are briefly observed before mixing with the yellow dots is complete, after which time ...
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3answers
1k views

Does water evaporated from sea water contains any salts in it?

I want to know whether water evaporated from sea water is liable for drinking or not?
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2answers
205 views

Determining actual safety from a vague material safety data sheet

My desktop computer system employs a liquid cooling loop featuring a 6-litre external reservoir and radiator combination "cooling tower" unit. It isn't a cooling tower in the strict sense as it does ...
3
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1answer
129 views

Control the pressure of Hydrogen in a small container without the use of a pressure regulator

I had recently asked this question, and due to the comments and general consensus of safety concerns, I decided to re-ask the question, attacking the problem from another angle. The Problem I need ...
4
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0answers
69 views

ZnO spontaneous combustion during transport

I found your contact information researching $\ce{ZnO}$ reactions. I was hoping you could please help me or orient me in the right direction to find an answer to my problem. The company I work for ...
3
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2answers
78 views

How does LC50 translate to “real world” exposure for paint thinner?

Last year I started oil painting, which means (in part) that I use paint thinner for working with and/or cleaning brushes. I recently became concerned about my exposure to the vapor from the paint ...
15
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4answers
24k views

Are modern newspaper inks a health risk?

It's very common in India to see newspapers being used to absorb oils from oily snacks, or simply for temporary food packaging. Some articles say that covering food items in newspaper is a health risk....
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1answer
66 views

Safely storing hydrogen

I have built a solar panel which is used to add electrodes to $\ce{H2O}$ and $\ce{NaCl}$, evolving $\ce{H2}$ and $\ce{O2}$. How can I safely store the hydrogen in the long-term?
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2answers
272 views

Spreading of Chemicals (chemistry lab) [closed]

Is it possible to spread a chemical or the danger of a chemical if the chemical has dried up on a piece of paper? For example if in a lab I have gotten a certain chemical on my lab paper but the ...
3
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1answer
146 views

Is there any reason to fear personal exposure to rain with a pH of 3.1?

Where I live now there can be significantly acidic rain. The government posts measurements for many cities and there can be stretches for days or longer with reported pH of 3.2 or 3.1. I even saw 2.9 ...
2
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1answer
193 views

Supermarket HDPE plastic bags safety

Supermarket plastic bags are made of high density polyethylene, and I am interested in the decomposition products at high temperature: what type of compounds are released and how dangerous are they? I ...
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0answers
61 views

Endothermic Reaction with Specific Details

I need some information for a book I'm writing. Let's say you're in a confined space, about 8 feet by 8 feet. The area is being heated externally slowly (a few degrees a minute) to about 3,100 ...
1
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1answer
751 views

Toxic levels of baking soda

What is the amount of baking soda that would be considered toxic for skin? I ask because there is a lot of misinformation online about using baking soda as a "natural" underarm deodorant, and how it ...
0
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1answer
1k views

What liquid other than water that is safe to put on your skin will provide the most evaporative cooling?

Suppose that you are in some extremely hot and humid place where your sweat just doesn't evaporate well enough to cool you down. You can then consider putting a liquid other than water on your skin, e....
5
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2answers
740 views

Liquid-liquid caffeine extraction

I am performing a lab experiment in which I am extracting crude caffeine from different samples of tea. I have read a couple of similar experiments in which methylene chloride has been used to extract ...
2
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3answers
3k views

An explosion in a custard factory

I have a vague memory of a question on the BBC panel game QI which started with a long chemical reaction equation on the screen, asking what it might be. The answer was definitely "an explosion in a ...
3
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0answers
75 views

Safety regarding multiple metals in same acid solution

My son is testing the corrosion of metals in various solutions. Is it okay to place strips of multiple metals in the same container of a specific solution? Metals being tested: $\ce{Fe}$, $\ce{Cu}$, $...
68
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5answers
17k views

How do people know HCN smells like almonds?

I was told by my chemistry teacher that $\ce{HCN}$ smells like almonds. She then went on to tell a story about how some of her students tried to play a prank on her by pouring almond extract down the ...
2
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2answers
5k views

Mixing bleach and ammonia?

I know that the two should not be mixed, but i want to know that if the two become mixed in a contained unit, does it build pressure? Or can you seal the container safely untill it can be disposed of ...
2
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1answer
402 views

What happens in the NH4Cr2O7 with HgSCN reaction?

Apparently this video is a reaction of $\ce{NH4Cr2O7}$ with $\ce{HgSCN}$. The title of the video suggests the reaction opens a portal to hell, but I am pretty sure that is not the case. What ...
4
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1answer
56 views

Oxidizers Cabinet

I am currently reorganizing the chemical inventory in our lab and grouped all the oxidizers together. Would it be safe to put the following chemicals together in the fume hood cabinet? I have checked ...
1
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1answer
223 views

Where to store Sodium Azide?

I have about 100g of Sodium azide and would like to store it properly. Any suggestions as to where? I though of storing it in a locked vault but there are chemicals such as Arsenic sulfide, aniline, ...
7
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2answers
3k views

Testing for ammonia by smelling it?

My chemistry teacher taught us that one of the ways to see if we had produced ammonia gas in a reaction was if it released a pungent smell (Even BBC supported that here! http://www.bbc.co.uk/schools/...
2
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1answer
283 views

Is 98%+ purity Reagent Grade Ca-EDTA powder as safe to use as USP Grade in the body? [closed]

Is $98\%+$ purity reagent grade $\ce{Ca}$-EDTA powder as safe to use as USP grade in the body? Or, does the reagent grade have unsafe impurities that USP grade would not have even though they are the ...
0
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2answers
851 views

Can dry ice explode?

Can dry ice be used as a explosive chemical? I am intrigued by this chemical dry ice and seen various experiments with it, and seems to have potential to be a explosive. So can dry ice explode?
1
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1answer
137 views

Is exposure to amyloid beta proteins dangerous?

Recently, I began working in a lab in which our main area of study is Aβ peptides. My concern is whether or not exposure to high levels of Aβ proteins is hazardous. I suspect that the peptides cannot ...
0
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1answer
75 views

Hydroxide storage

I am figuring out what chemicals to store with Ammonium hydroxide. At the moment a 2-shelf corrosive resistant fume hood cabinet will be used. I have in mind storing the Ammonium hydroxide with ...

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