Bottle Polystop Dropper

Density bottles are mainly used to determine the density of liquids of moderate viscosity. They are not volumetric instruments, however, they are calibrated ‘to contain ‘ as in the case of volumetric flasks.

U–tube filled with a sodium hydroxide is used for a cleaned and dried gas. U–tube filled with a 1 mol dm^–3 aqueous potassium nitrate solution is used as a permanent salt bridge. U–tube is a device used for water electrolysis, for laboratory hydrogen and oxygen obtaining.