Question

Why is it hard to tell if a mixture contains salt?

Answer 1

It's hard to tell if a mixture contains salt because you have to wait for the liquid to evaporate before you can see salt crystals if there are any.

Answer 2

It is often difficult to tell if a mixture contains salt because in an aqueous or liquid mixture, salt is highly soluble. For example, when you make salt water, the final solution appears the same as normal water because the salt dissolves easily into the water.

Hope this helps