you are given two samples one is of pure water and another one is a solution of common salt in water without tasting how will you distinguish between them?????
Answers
In Salt water circuit will get completed while not in simple water
1) Measure the density. If the glasses are identical (have the same mass) and the volume of water is equal, just put the two glasses of water on a balance and see which one weighs more -- that’s the saltwater one.
2) Put a drop of the water from one on the end of a nail or something and put it in a gas flame. The salty one should turn the flame yellow/orange. Try this with the nail with nothing on it first to see if it causes a false positive. Even a tiny amount of salt (for example, from a little leftover sweat from your fingers) will turn the flame yellow/orange.
3) Measure the electrical conductivity -- an ohmmeter with probes you can stick in the glasses should do just fine. Saltwater conducts electricity much more than the pure water.
4) Let them evaporate -- the saltwater glass will leave a caky residue absent from the pure water glass. You may not even have to evaporate very much of them before you see the difference on the sides of the glasses.