Question

preface for electrolysis of water

Answer 1

Electrolysis of water is the decomposition of water  into oxygen hydrogen  gas due to an  electric current passed through the water. The reaction has a standard potential of −1.23 V, meaning it ideally requires a potential difference of 1.23 volts to split water.

This technique can be used to make hydrogen fuel(hydrogen gas) and breathable oxygen; though currently most industrial methods make hydrogen fuel from natural gas instead.

Answer 2

$\tt \red { \pmb{\: \underline{To \: Demonstrate \: The \: Electrolysis \: of \: Water}}} : -$

$\bf \: { \pmb{ \colorbox{lavender}{ \blue{Material \: Required}}}} : -$

• One Battery of 9V
• Two Graphite Pencils
• One Beaker
• Tap Water
• Connecting Wires and tape

$\bf \: { \pmb{ \colorbox{lavender}{ \blue{Procedure }}}} : -$

• Sharpen both ends of both the pencils.
• Fill the beaker with tap water. Make sure that the contact with the Graphite in the pencils is perfect
• Secure the wires with tape.
• Use a piece of Cardboard to hold the pencils in a vertical position.
• Place the exposed tips of the pencils in the water,such that tips are fully submerged but aren't touching the bottom.
• The pencil is being used as ELECTRODE here. Now, Wait for 3-4 minutes and observe carefully.

$\bf \: { \pmb{ \colorbox{lavender}{ \blue{Observation }}}} : -$

• Small Gas Bubbles will formed near the electrodes.
• The change takes place in the tap water is the Chemical Change.