Today I am going to show you a reaction electrochemistry that will serve to clean silver in a very simple way. First I put water in a container to heat it. We will calculate the amount of water according to the volume of the container where are we going to do the cleaning of silver. I add a couple of teaspoons sodium bicarbonate and I dissolve it. We heat the water so that the reaction is faster. In a container we put aluminum foil. This is enough. And now we put the water in the container with aluminum foil. And I put the piece of silver we want to clean. It is producing a Electrochemical reaction between silver sulfide what is it that stains our piece of silver and aluminum. Sodium bicarbonate acts as electrolyte, that is, this operation it's something like a battery, for example the battery of a car. About ten minutes later we take out the piece and with a paper or with a cloth we rub it. We could repeat the process again to get even more brightness, but now you can see it is quite bright now. When silver gets dirty it is because silver reacts with sulfur of hydrogen in the air of the environment to produce silver sulfide which is a black substance, that's why we found the old silver with some stains with a dark patina or even black. Let's take advantage of the property that sulfur has more affinity for the aluminum that for the silver this will produce a electrochemistry reaction in which the silver of the silver sulfide is reduced and on the other side the aluminum is oxidized.repeat I will the experiment, but now with a silver spoon, not as dirty as the previous piece. We can accelerate the reaction putting a few pieces of aluminum foil on top and better still if we sand them a bit. This way the metallic aluminum will be closer to silver or better said to silver sulfide so that it produce the reaction. Twenty minutes latter. Let's see what happened to the spoon. We have here the spoon observe the difference between the part that has reacted and the part that hasn't. This is today's episode. See you Monday at Cienciabit.