How can you determine if a colorless liquid is water?
Why the colourless liquid is not water
Suggest a way to determine whether a colorless liquid is pure water or a salt solution without tasting it?
Let the liquid evaporate. If there is a residue (white), then your liquid was likely the salt soln. This would only work if you are dealing with the two options (pure water or salt soln.) Salt water will also conduct electricity better, it has a greater density and it will refract light more than pure water.