New answers tagged safety
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Wikipedia states specifically that silver nitride is slowly formed from solutions of silver oxide or silver nitrate in aqueous ammonia; it does not mention other silver salts as potential precursors.
In case the nitride does form, you can look for it, and if you suspect anything you can easily dissolve it in dilute ammonia solution. From the WP article:
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The ammonium hydroxide would convert the silver chloride to ammonium chloride and a precipitate of silver probably silver oxide also. On a small scale it shouldn't be dangerous , maybe have an ice bath handy just in case and always wear appropriate ppe
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I was looking for help in releasing a stuck No. 29 glass stopper in a one liter bottle. I had sprayed a little WD40 at the joint and after several minutes it was still very stuck. After reading here, I held the bottle in a pail of very hot water up to the neck for 30 seconds. Then I tapped the stopper with another stopper and presto, the stopper popped ...
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Material food contact safety rating is not a simple topic. Depending on how a product is made, it may be approved or not. BPA and other plasticizers are only one component.
See the particular manufacturer's NSF, FDA or USDA rating. Can they substantiate the claims for thermoplastic elastomer (TPE) or thermoplastic rubber (TPR) with accreditation? Note that ...
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The key to toxicity is concentration, which is related to how rapidly the material disperses (or concentrates) in the environment. Which is also related to water type (fresh or salt) and temperature. MSDS sheets are a bit of a joke. They are worded in a way that fends off lawyers rather than gives detailed useful toxicity data. Consider this MSDS for Sodium ...
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Usually, if people have experience of boiling water at home and think a while about it, they are able to answer it themselves. These "boiling tubes" are used primarily for ambient temperature testing, so they are called test tubes, or test-tubes.
Taking a test-tube in and out is for decreasing the heat flow to prevent violent overheating and the ...
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