Question

A student makes an electric circuit using an LED, a battery and connecting wires. The
student notices that the LED does not glow. He replaces the distilled water with a salt
solution and observes that the LED glows. How does the salt solution help the LED to
glow?

Salt solution is covalent in nature and conducts electricity.

Salt solution has a low melting point which allows the current to flow through it.

Salt solution has a high boiling point which allows the flow of current in the circuit without getting hot.

Salt solution contains ions which makes it conductive and allows the electricity to flow through it

Answer 1

Answer:

which class is this for a student in the following is not required for this

Answer 2

The salt solution helps the LED to glow because- Salt solution contains ions which makes it conductive and allows the electricity to flow through it.

• The ions are known for their conducting property in liquid or aqueous solutions as they are free to move in the solution.
• Distilled water does not contain salts in it and hence, there are no ions.
• The salt contains sodium and chloride ions that freely move throughout the solution. They help in conducting electricity by moving to opposite ends of the electrode.
• Hence, the LED glows when distilled water is replaced with saltwater.