Question

describe the activity showing electrolysis of water with diagram ​

Answer 1

Two leads, running from the terminals of a battery, are placed in a cup of water with a quantity of electrolyte to establish conductivity in the solution. Using NaCl (table salt) in an electrolyte solution results in chlorine gas rather than oxygen due to a competing half-reaction. With the correct electrodes and correct electrolyte, such as baking soda (sodium bicarbonate), hydrogen and oxygen gases will stream from the oppositely charged electrodes. Oxygen will collect at the positively charged electrode (anode) and hydrogen will collect at the negatively charged electrode (cathode). Note that hydrogen is positively charged in the H2O molecule, so it ends up at the negative electrode. (And vice versa for oxygen.)

Note that an aqueous solution of water with chloride ions, when electrolysed, will result in either OH− if the concentration of Cl− is low, or in chlorine gas being preferentially discharged if the concentration of Cl− is greater than 25% by mass in the solution.

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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.