How to make potassium nitrate at home with instant cold packs and "sodium-free" salt.
"Sodium-free" salt is actually potassium chloride. Instant cold packs contain ammonium nitrate and if the two are mixed potassium nitrate and ammonium chloride are formed in equilibrium. Fortunately potassium nitrate has lower solubility than ammonium chloride at colder temperatures giving us a means of separation.
Just mix 40 grams of ammonium nitrate with 100mL of water and stir until dissolved. Filter the mixture directly into 37 grams of potassium chloride. Gently heat until completely dissolved, do not boil. Cool the mixture to 0 Celsius in the freezer or on an ice bath. Filter the crystals and dry them. Now you have potassium nitrate.
In this video we make copper formate, a useful precursor to copper conductive ink.
We simply dissolve 65g of copper sulfate in 250mL of water and 33g of sodium carbonate in 150mL of water. Then we mix the two together. Copper carbonate hydroxide precipitates and we filter that off. Then we react the copper carbonate hydroxide with formic acid to create copper formate.
Copper formate has the useful property that it decomposes into copper metal (along with carbon dioxide and hydrogen) when heated. The copper produced this way isn't well bonded and not very conductive. But in upcoming videos additives may be added to improve the quality of the product.
Related videos:
Silver conductive ink: https://www.youtube.com/watch?v=EBlqPS8boLI
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https://www.youtube.com/watch?v=auyCK8-DMP0
In this video i test Eucalyptol to see how it behaves in the sodium production reaction. I'm hoping to try and find a way to avoid dioxane.
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https://www.youtube.com/watch?v=lL6CDW49MTA
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Use the discount code "copper" for a 5% discount.
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In this video we synthesize propionic acid from methyl ethyl ketone and bleach.
An important prior video you see first is creation of chloroform by the haloform reaction: https://www.youtube.com/watch?v=MvkuqLxQd2c
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https://www.youtube.com/watch?v=iDMuQtglPIw
How to make Silver Nitrate from Silver and Nitric acid.
WARNING: This reaction produces toxic nitrogen dioxide gas. Do not perform this reaction indoors, only do it in a fumehood or outside.
Simply place some pure silver in concentrated nitric acid and heat it up. The reaction proceeds too slowly in cold nitric acid to be useful.
Wrap your silver in aluminum wire to better control the reaction. If it proceeds out of control and fizzes too much or generates too much gas too fast then you can pull the silver out of the acid to stop the reaction.
Only aluminum is resistant to nitric acid, other metals are destroyed and will contaminate your acid.
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https://www.youtube.com/watch?v=d6hPgGV_qAg
In this video we make triboluminescent or smash-glow crystals.
Triboluminescence is the phenomena where light is generated when something is rubbed or fractured. The exact mechanism by which triboluminescence works is still under investigation, but the best theories so far propose that the breaking of the structure causes charge separation that release energy upon recombination. This energy is picked up by nearby atoms, in this case europium, and released as light according to their ionization or fluorescence spectra.
Many substances exhibit triboluminescence including sugar and tape. But Europium Tetrakis (Dibenzoylmethide)Triethylammonium is one of the strongest available and its glow can easily be captured by a camera.
It's made by mixing 100mL of Ethanol, 2.93g of dibenzoylmethane, 1.4g of europium nitrate pentahydrate and 1.9mL of triethylamine. The mixture is heated until everything dissolves and then allowed to cool slowly to obtain crystals that are filtered off and washed with ethanol. After thorough drying they are ready for use.
A frequently asked question is if this stuff is hot when it is used. The answer is no, the crystals do not undergo a chemical transformation and thus they do not release or consume heat, but remain at constant temperature. There may be some small heating due to friction when they are broken, but that is not from the crystals or a special property of triboluminescence.
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https://www.youtube.com/watch?v=xQhLSoB-uBE
In a variation of luminol chemiluminescence, we make a coin appear to glow with ghostly trails.
Get 10mg of luminol and dissolve it in 10mL of 10% ammonia solution, the exact concentration isn't critical. Then add 1mL of 3% hydrogen peroxide and dilute the whole solution into 100mL of distilled water.
Get a piece of copper metal, a penny will do, and drop it in with the lights out.
The penny will start to glow as the surface dissolves to form a copper amine complex. The complex catalyzes the reaction of hydrogen peroxide on luminol and causes the solution near the coin to glow. Bright trails can be seen if the copper is moved.
Eventually the concentration of copper in solution rises to the point that all of solution glows and masks the glow near the coin. The reaction will quickly extinguish as the luminol is used up.
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https://www.youtube.com/watch?v=CQ4145kogvY
We make the classic copper sulfate and zinc battery using the incredibly easy "gravity" battery design approach. Great for science fairs and similar projects this battery can be used to explore many basic concepts in batteries.
All the components can be gotten from our previous videos:
Copper sulfate:
http://www.youtube.com/watch?v=arlYPz3EP7A
Zinc: http://www.youtube.com/watch?v=knc1lSupAwQ
Sulfuric acid: http://www.youtube.com/watch?v=okvvD3-DF9U
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https://www.youtube.com/watch?v=Id3tL2iI0Vw