At room temperature, the density of sodium is slightly less than that of water and it will, briefly, float (briefly, because it will be rapidly reacting with the water, and may in fact be on fire at the time).
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If an object placed in water sinks - then it has a density greater than water.
A density greater than that of water (which varies with temperature).
because salt is higher density than water and dissolves in the water, increasing density
It depends upon the temperatures and purity of the two quantities of water. If they are both at the same temperature and both have the same purity, they will both have the same density as density does not depend upon the volume, but the substance itself. If they are at different temperatures, or have different purities, then they will have different densities, but which would be greater would depends upon which has which temperature and which purity.
Seawater has a greater buoyant force than fresh water because seawater has a higher density than fresh water therefore the buoyancy is higher. *Improved* This happens because when water mixes with the salt in sea water, the density changes to the average density which is around 1.55 g/mL (Average density is the density of different materials put to together )