universal indicator paper- if it is green it has a pH of 7
Do you know it is pure when you have checked the pH?
No, you still need to test for dissolved salts
How do you test for dissolved salts?
-fill a basin with water and weigh it on a balance-place the basin on a tripod and gauze over a bunsen burner-heat until evaporated-then weigh again-if the water contained any salts the weight will increase
