This is definitely one of my favorite compounds, it’s called Copper(II) Nitrate (Cu(NO3)2).
As you can see, it is a really beautiful compound because of the color of its deep-blue crystals.It is widely used in labs, it converts to copper(II) oxide, which is used as catalyst for a variety of processes in organic chemistry. Its solutions are used in textiles and polishing agents for other metals.
I mixed a solution of CoSO4 and a solution of Cu(NO3)2 and I got these ions in solution
Cu+2, SO4-2, NO3- and Co(H2O)6+2
Chemical reaction between copper (the coil) and silver nitrate dissolved in water. The silver reacts with the copper coil and grows crystals around it. The reaction is instantaneous and very pretty. The blue color of the water is a result of the copper nitrate released in the reaction.