The short answer is nothing. If there was a substance that absorbed salt, it would be employed to desalinate sea water into drinking water in many parts of the world already. There are some complicated and expensive processes that can "absorb" salt, although they rely on other energy inputs (chemical, pressure, filters) to force water away from salt, or salt away from water.
Water "dissolves" salt. Water does not absorb salt.
Yes, your body does absorb salt from home soft water systems, however, amounts are generally small. Unless you are on a low-sodium diet, salt levels in water softening systems are generally nothing to worry about.
eat a little more watermelon because it can absorb lots of vitimans and minerals
No, salt absorb moisture.
The salt will absorb the water.
Sodium chloride is hygroscopic, absorb water.
yes
No.
Salt is very hygroscopic, easily absorb water.
Yes, because salt absorb easily water.
Salt water already contains a high concentration of dissolved minerals (such as sodium and chloride) which reduce its ability to absorb further minerals from objects compared to plain water. The dissolved minerals in salt water alter its chemical composition and reduce its capacity to absorb additional substances.
Adding rice to a shaker of table salt to absorb ambient moisture is a trick that has been used for as long as I can remember. It doesn't absorb moisture from the salt so much as from the around the salt.