In this video we restore s silver metal coin with electrochemistry.
Old silver is often tarnished by a thin layer of silver sulfide that appears as a brown color. The silver sulfide can be electrochemically converted back into pure silver if a negative potential is applied.
To do this, first make a solution of 200mL water and 20g sodium chloride (salt) with 10g sodium bicarbonate (baking soda). They won't completely dissolve but this is acceptable. Then simply place a silver object in the solution and contact it with a large piece of aluminum foil. In a short time the silver will be restored.
A very cool way to do the same thing is to use a battery. Connect the negative end of the battery to the silver and the positive end to a large electrode, like a copper plate, and dip them both in the solution.
This process occurs due to electrochemical reduction of the silver sulfide to silver.
Make Potassium Nitrate from Instant Cold Packs and Potassium Hydroxide
Warning: This reaction will produce large quantities of toxic ammonia gas. Perform the reaction outside or in a fume hood. Potassium hydroxide is highly corrosive; wear gloves when working with it.
Also note that this video is for those interested in the chemistry, it's not cheaper/better/easier than buying it.
Take 60g of potassium hydroxide and combine it with 80g of ammonium nitrate. We showed how to obtain ammonium nitrate from instant cold packs in a previous video. Potassium hydroxide is sold online to make homemade soaps and for biodiesel.
Now add 30ml of water and gently heat the mixture. It will first bubble as it releases ammonia gas and then continue heating until it boils. Let it cool and evaporate to dryness.
...
https://www.youtube.com/watch?v=XxhZkDAOeQ8
In this video we make "Wildfire" from Game of Thrones.
I've collaborated with my friend PixelLitch and sent him the bottle of wildfire which he used in his video here:
https://www.youtube.com/watch?v=UkwaE0J5QFM
The wildfire in this video is actually an azeotropic mixture of trimethyl borate and methanol. Trimethyl borate burns with an intense green flame that looks very much like wildfire from "Game of Thrones".
To make it we mix 200g of Borax, 650mL of methanol and 100g of sulfuric acid (98%). We then set up a fractional distillation column and distill of the fraction at 54 degrees Celsius which is azeotropic trimethyl borate.
...
https://www.youtube.com/watch?v=iyHOBQl-yQI
In this video we create a glow stick that pulses light.
To this we first dissolve 37mg of copper sulfate in 100mL water. In a separate container we dissolve 3.6g potassium thiocyanate, 1g sodium hydroxide and 0.2g luminol in 200mL of water. This solution is stirred until completely dissolved. Then the two solution are mixed and water is added until the total volume is 1L.
The solution may be heated to 50 celsius for improved effect.
30mL of 30% hydrogen peroxide is added with stirring and the lights are switched off. There would be a faint glow that pulses brightly every 30 seconds. I got 6 pulses before the reaction stopped.
...
https://www.youtube.com/watch?v=Jo-7mhKXfoA
Glassware generously provided by http://www.alchemylabsupply.com/
By popular request, how to make Copper (II) Chloride.
The first and simplest method is to get hydrochloric acid of around ~20% concentration and add copper. Then bubble air through it using an aquarium pump. The oxygen in the air oxidizes the copper and reacts with the acid to produce copper chloride. Pretty much any concentration of acid can be used, but we recommend around 20% as there are considerably less fumes. A major drawback of this method is that it's VERY slow and can take days to produce useful quantities of copper chloride.
The second far faster method is to react hydrochloric acid and copper with an equal volume of hydrogen peroxide. The recommended concentration of acid is greater than 20% and the peroxide is equal or greater than 3%. In our video we used 200 mL 31% hydrochloric acid, 30g of copper and 200 mL of 6% hydrogen peroxide. This reaction only takes a few hours to finish.
For many applications like PCB etching or gold recovery from circuit boards, sulfate contamination is not a problem so the third method uses readily available copper sulfate. Just take the copper sulfate and add as much hydrochloric acid as necessary to dissolve it. This directly produces copper chloride that can be used for the previously mentioned application. It will be contaminated with sulfate ions but these have no effect.
...
https://www.youtube.com/watch?v=V8mHiFYmlBc
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.
To test it mix 2 parts potassium nitrate with one part sugar and light it up. It should burn with a purple/pinkish flame.
...
https://www.youtube.com/watch?v=xOjtlIxYYbs
In this video we make sodium magnesium oxide aggregate. A useful substitute for sodium metal in most cases.
Doing this is very simple, we combine 30g of magnesium metal turnings or powder and 40g of sodium hydroxide in a metal container. The mixture is ignited with sparklers or a fuse and the container is covered with a heavy lid to protect it from air. The mixture will burn and generate hydrogen gas. What's produced is a mixture of sodium metal interspersed with magnesium oxide. While not pure sodium, it has much of the same reactivity and can be used for solvent drying in place of sodium.
Because the aggregate is highly reactive, even toward air, it is recommended to store the aggregate under an inert solvent like toluene or mineral oil.
Related videos:
Nighthawkinlights video on making sodium: https://www.youtube.com/watch?v=seSg_GWj1b0
...
https://www.youtube.com/watch?v=ZXCSL0r4aqg
We continue testing more catalysts for the sodium production reaction from magnesium and sodium hydroxide.
Donate to NurdRage!
Through Patreon (preferred): https://www.patreon.com/NurdRage
Through Bitcoin: 1NurdRAge7PNR4ULrbrpcYvc9RC4LDp9pS
Glassware generously provided by http://www.alchemylabsupply.com/
Use the discount code "nurdrage" for a 5% discount.
...
https://www.youtube.com/watch?v=iqNiSCdOPIs
In this video we grow crystals of pure silver metal by electochemistry.
The procedure is fairly simple. Just apply an electric current between a silver anode and an aluminum or silver metal cathode while they are immersed in silver nitrate solution. The silver ions from the anode will deposit on the cathode.
The crystals are microscopic so to see them the solution is placed under a microscope. A glass slide may be placed over the solution to keep the surface flat so you can see it better.
The crystals grow in different shapes depending on concentration and current applied.
...
https://www.youtube.com/watch?v=fnyBldC4Ra4
Glassware generously provided by http://www.alchemylabsupply.com/
Use the discount code "copper" for a 5% discount.
Donate to NurdRage!
Through Patreon (preferred): https://www.patreon.com/NurdRage
Through Bitcoin: 1NurdRAge7PNR4ULrbrpcYvc9RC4LDp9pS
In this video we construct and demonstrate a Dean-Stark trap. A very useful piece of equipment when distilling azeotropic mixtures of immisicble liquids.
This video has been generously supported by the following sponsors:
...
https://www.youtube.com/watch?v=jxgpLp279Yc