This depends on the density of the saline water and the density of the tar.
For an assumed tar density of 1,15 g/cm3 and for a salt water with a concentration under 200 g/L the answer is yes.
It will float for a while than slowly sink because its density as a cube is Heavier than water (by the way waters density is 0.9-1.0 g and Tar is 1.02 g). I hereby conclude with all reasons that tar ( in a shape of a cube) will float then sink
Tar , gob or salt .
Tar is denser than water, so it will sink in water.
Tar can be separated from water with some products that are known to remove it. You cannot completely remove the residual tar chemicals from water without advanced filtration.
From thickest to thinnest: lava, tar, honey, then water.
A tar can float on seawater because it is less dense than water. The buoyant force acting on the tar can is greater than its weight, allowing it to float on the surface of the water. This is due to the buoyant force exerted by the water displacing the tar can, supporting its weight and allowing it to stay afloat.
"Tar" is a 3-letter word for old salt, in the nautical sense.
They had salt and tar, fine clay for pottery. Also wood and rubber and a river for transport.
Pip substituted tar-water for the brandy in the stone bottle.
"Tar' is a very general term for any, well, tar-like substance; it's not a specific compound or mixture of compounds. Most tars have no particular reaction with water.
No all tar does float. For something to float then it must be less dense than saltwater.
Your mother (the total cretin, the sub-human piece of rubbish that wrote this answer is one example of why euthanasia of such thick skulled no necks might be acceptable. what do you think?)