To what density does salt dissolve in water?
It depends on what kind of salt you mean. If you mean ordinary table salt, then its solubility changes little with temperature:
35,6 g / 100 ml (0 C)
35,9 g / 100 ml (+25 C)
39,1 g / 100 ml (+100 C)
Below is a table of the dependence of the density of sodium chloride solutions on
This can be tested with raw eggs. If it floats, then the density is increased.