Q) Differentiate between electrolytes and non-electrolytes. ...give two examples of each and .....describe an experiment to identify them as electrolytes and non-electrolytes??...i don't have ans.. pls help me..
When an ionic compound such as sodium chloride is put into water, the water molecules attract both the cations and anions in the crystal and pull them into the solution. The cations and anions get distributed throughout the solution.You can detect the presence of these ions by using an instrument called a conductivity tester. A conductivity tester tests whether water solutions of various substances conduct electricity. It’s composed of a light bulb with two electrodes attached.
The light bulb is plugged into a wall outlet, but it doesn’t light until some type of conductor (substance capable of transmitting electricity) between the electrodes completes the circuit. (A finger will complete the circuit, so this experiment should be done carefully.)
When you place the electrodes in pure water, nothing happens, because there’s no conductor between the electrodes. Pure water is a nonconductor. But if you put the electrodes in the NaCl solution, the light bulb lights, because the ions conduct the electricity (carry the electrons) from one electrode to the other.
You don’t even need the water. If you were to melt pure NaCl (it requires a lot of heat!) and then place the electrodes in it, you’d find that the molten table salt also conducts electricity. In the molten state, the NaCl ions are free to move and carry electrons, just as they are in the saltwater solution.
Scientists can get some good clues as to the type of bonding in a compound by discovering whether a substance is an electrolyte or a nonelectrolyte. Ionically bonded substances act as electrolytes. But covalently bonded compounds, in which no ions are present, are commonly nonelectrolytes.
Table sugar, or sucrose, is a good example of a nonelectrolyte. You can dissolve sugar in water or melt it, but it won’t have conductivity. No ions are present to transfer the electrons.
electrolytes react with water to form ions in solution, and nonelectrolytes have molecules.Electrolytes are ionic compounds and some covalent compounds like strong acids. Non electrolytes do not ionize in water. Only covalent compounds like CH4 and C6H6 can be nonelectrolytes..
Compounds whose solutions in water or whose molten states are capable of conducting electricity are called electrolytes. They are either acids, bases, or salts. Solutions of these compounds contain ions. Electrolytes which in solution are completely or almost completely in the form of ions are called strong electrolytes. They are very good conductors. Those whose solutions contain mostly covalent molecules are poor conductors of electricity and are called weak electrolytes. Non electrolytes are compounds whose solutions DO NOT conduct electricity....