Prepare saturated solution of Ammonium Sulfate, for example ~550g made up to 1L distilled water.
The specific volume of ammonium sulfate is also dependent on the temperature but is about 0.
This program and the different publications listed above may give slightly different results, so who is right? Ammonium sulfate forms many ammonium metal sulfates when its solution is mixed with equimolar solutions of metal sulfates and the solution is slowly evaporated.