Gold - THE MOST CORROSION RESISTANT METAL!

Gold for ordinary people hello everyone in this video I am going to tell about gold a metal which can be used not only for making jelly but also for making highly effective medicines and even tests for different diseases in the product table of chemical elements gold along with silver and copper belongs to group 11 the history of humankind is closed interact with these free resistant metals because due to their lower activity is a naturally occur in their pure forms but in contrast of silver and copper people first noticed pure gold because it's glossy shine attracted more attention as a dull silver and copper ores about 40,000 years ago our ancestors began using this metal as generally because gold is too soft for making tools or weapons this is a reason why about 3000 years ago first coins in ancient Lydia were made not of pure gold but rather of it's naturally occurring alloy with silver called electrons because silver in the alloy made coins harder unfortunately notice encounter in native gold for ordinary people is almost impossible that is why in order to demonstrate your properties of this metal I bought one gram of this precious metal and it goes 70 euros just like all other gold found on earth the small bits of gold formed as a result of nuclear synthesis in had a far-off exploding supernova or when two neutron stars collided also God's atomic mass isn't that big it is way less abundant in Earth's crust than uranium ore at Orem even froze the likelihood of their synthesis during cosmic explosion is much flour it turns out that because of its high density and low chemical activity at the early stage of Earth's formation almost all gold on our planet sank into the planet's iron core very storm or uranium just oxidize it and dissolved in the molten minerals that is why all that's left is to be content with a tiny amount of God which was ejected in lava from the Earth's center during volcano eruptions and broad by asteroids of course modern technologies allow people to synthesize gold on their own for instance by bombarding bismuth atoms in a particle accelerator to knock in some protons and neutrons from them receiving different isotopes of gold however the majority of such isotopes will be early active and the cost of one gram of gold produced with such particle accelerators will be a million times that of gold dug in mines that is why we should be happy that all the hard labor has been done by nature inside huge and hot stars as I mentioned earlier God's density is one of the highest being just 40% less dense that the densest metal Osmo at the same time pure gold is very soft I decided to check how pure my nugget of God is using an old technique which is biting it with my teeth is a sharp didn't cheat and there is a noticeable mark on the gold nugget left by my teeth which indicates that this is fine gold if either silver or copper is added to God becomes significantly harder and there will be no marks left by ZTS on such gold piece besides a bite in taste we can also easily bend such a gold nugget with bare hands in my opinion its softness is similar to that of lead for the sake of good order I also decided to check the hardness of my gold nugget with this hardness tester and also to see how its hardness compares with Z of lead Gold is slightly harder than lead but it's a hundred times more expensive and twice as dense that is why nowadays gold early is not made of pure gold rather it is made of alloys of gold either with silver or copper in Auto foresight surely to be harder if you didn't know the content of God in your necklace can be determined using the marked phoniness and your journaling for instance the finest 585 means that God makes up 58.5% Herrera this precious metal can be used not only for making jewelry but also for making scientific devices for instance gold films is used for making highly sensitive detectors which can detect just several items of highly reactive and volatile elements speaking of oil a pure gold can be rolled into a sheet the sickness of which is thousand times smaller then the thickness of a human hair thus you'll get a gold leaf now it's time to learn about the chemical properties of this precious metal first let us see how God reacts with different ages I decided to run the first test with concentrated muriatic acid and I'm also going to see how an aluminum father acts with this acid we can clearly see that aluminum immediately starts reacting with hydrochloric acid whereas God does not with it at all now let's see if God can withstand concentrated nitric acid for comparison I have also submerged a piece of copper in it just in several seconds copper actively starts dissolving in the nitric acid releasing a reddish gas which is nitrogen dioxide whereas gold does interact with nitric acid it can only get rid of the deem that layer left by my fingers for my next experiment I decided to boil this poor piece of gold in a molten alkali some time later the glass jar itself started dissolving in the sodium hydroxide speaking of gold it didn't change and unstuck to the formed sodium metal silicate which formed when glass started reacting with sodium hydroxide that's why is fair to say that Gold doesn't react neither with common assets nor with alkali for the last experiment with this piece of gold I decided to use a gas burner when heated above 1000 degrees Celsius Gold starts melting but along with that it doesn't oxidize that's what I call durability because of its durability gold is used to color contacts for many electric devices for instance processor connectors pins or context of computer data storage besides God reflects light very well especially infrared light that is why many satellites are covered with gold foil in other for them not to overheat in the sunlight however no matter how resistant this mantle Easter Isis and alkali under special conditions it can be chemically altered and dissolved to show you that I have submerged this piece of gold into 5 milliliters of hydrochloric acid just like the previous time and at first nothing was happening but then I added one milliliter of concentrated nitric acid and then started heating it all and now gold finally started to slowly dissolve the thing is when concentrated hydrochloric and nitric acid are mixed together they create what's known as aqua regia which from a chemical point of view is a solution containing chlorine nitrogen dioxide and nitrous or fluoride all these chemicals make the mixture highly corrosive which is why such metals as gold and even platinum can dissolve in this early ocean when gold is dissolved in aqua regia it releases nitric oxide and trace chloroauric acid dyes a solution in yellow color that is why even in spite of its high resistance to acids even God can be dissolved under certain conditions just in 20 minutes of heat and in aqua regia the one gram of God completely dissolved without any traces and I think an experienced people won't even guess that there is gold in the solution in such a way you can hide you go treasures just as Hungarian chemist George de Hevesy he'd got noble metals of Max von Laue way and James Franck edited when Nazi Germany occupied Denmark during the Second World War if you didn't know this your solution can be turned back into gold i diluted it with water and then added a solution contain 2.6 grams of sodium metabisulfite when chloroauric acid reacts with sodium metabisulfite metallic gold start depositing and it actually doesn't look like gold the thing is now these particles are too small and cannot reflect light like a whole nugget of gold after depositing and filtering gold particles with a regular filter in other not to lose any of the precious gold I am NOT separating gold from the filter I rather am dry as a cool filter and then unburden it in a smoke crucible when being melted the majority of gold remains in the flux where is a paper filter will just burn down with the help of a gas burner I managed to turn that weird powder back into gold droplet for my next experiments I needed soluble compounds that is why I dissolve my goat once again now I'm going to use this solution for obtaining gold nanoparticles which is a very promising material in medicine and other branches the process is fairly simple I am just adding a couple of droplets of 9% chloroauric acid solution to 200 milliliters of water and heat in the solution to 95 degrees Celsius after heating the mixture I'm adding 2 milliliters of 1% trisodium citrate and start waiting a couple of minutes later the color first changed to blue Zent violet and in the end it became bright red the trisodium citrate is loaded reducing gold from its components creating gold nanoparticles because of their small size of just several tens of nanometers both particles don't deposit on the bottom of the beaker but rather they create a colloidal solution which is a stable suspended matter these particles resonate with light changing the color of solution turret if I point a laser as a solution we will see how the beam of light is reflected of the suspended particles in the water solution interestingly enough if we add a little bit of 5% of salt solution the gold particles in it will start merging and the color of the solution will change since the salt solution has merged gold particles the beam of light passing through them gets brighter no days such gold nanoparticles have a lot of potential application in medicine for instance molecules of medicine can be attached to such Gotanda particles and they can be used to transport molecules to the needed organs in our body also recently there has come our news that gold nanoparticles can be used to make novel tests for the very well-known recent disease in which antibodies will be attached to go to particles reacting to collide nineteen to sum up we can say that besides being used for making different gold generally god has a huge potential to be used for making future medicines and materials application of which we are yet to see that is why if you want to see more chemical reaction with this metal don't forget to subscribe to my channel and give this video a thumbs up

Channel: Thoisoi2 - Chemical Experiments!

Views: 236,224

Keywords: gold, resistant metal, most resistant, gold chemistry, experiments with gold, chemistry experiments, gold nugget, dissolving gold, gold extraction, synthesis, gold oxidation, inorganic chemistry, inert metal, gold nanoparticles, colloidal gold, nanotechnologies, gold solution, aqua regia, gold particles, melting gold, Thoisoi channel

Id: reMP1aP8Tgg

Length: 14min 6sec (846 seconds)

Published: Sat May 09 2020