Dissolve 2.5 g of silver nitrate in 50 mL of water, start bubbling acetylene gas until no more brownish silver acetylide precipitates. Filter, wash with 100 mL of water, store under water. Do not let to dry.
2 AgNO3 + C2H2 = Ag2C2 + 2 HNO3
Bubbling the acetylene through the solution
Filtration of the mixture
The pure product