If it is used as a food additive, yes.
For purified salt, any difference - sodium chloride (NaCl).
Sodium chloride is extracted from salt mines or sea water and after this is purified to become table salt.
purified
purified
Purified salt may not be safe to eat because it may have the bacteria of the rock salt on it still. To make it pure you should boil the bacteria off the salt after it has been purified.
Salt that has had any contaminates removed.
It all depends on what you mean. Tap water has more salt than purified water but purified water can hold more salt if salt is added. There is more room, so to speak, for the salt ions to fit into a container.
yes it can be purified
Because salt doesn't sublime !
There is currently a booming gourmet market in "sea salt" from different oceans of the world. Sea salt has much higher mineral content than purified "supermarket" salt, and different sea salts have different colors and flavors. Some years ago, there was a minor market in Sea Salt as a specific "health food", but the FDA put a stop to that. However, as a gourmet type of salt, it is legal to market it, and currently, it is very lucrative.
Rock salt (impure salt) is frequently colored.
Yes, it is true; but the table salt (sodium chloride) is purified.