Salt is a soluble solid, and by adding a considerable amount of it to a solute, we can increase the solutes weight.
We can also increase or give the solute(s) taste. The taste of salt is what we call "salty".
A interesting effect that adding salt could cause would be toggling the pH of the solution. The general pH of salt is 7, but not all salts could actually change a solutions pH.
During active transport, the sodium pumps would transfer the solutions opposite the concentration gradient. This means that it would go from Solution A to Solution B