Favourite Practical

My favourite practical experiment would be the bouncy raw egg with moving waters (1P15). The experiment's objective was to demonstrate osmosis in living cells. Here are the apparatus and materials needed for the experiment;

• raw quail's egg
• dilute hydrochloric acid
• beaker
• glass rod

Here is the procedure-

Be careful- the acid is corrosive!

1. Place a quail's egg in the beaker.
2. Fill the beaker with dilute hydrochloric acid.
3. Soak the egg in the acid for about 15minutes, stirring gently with a glass rod occassionally. 
4. After 15minutes, pour the acid away from the beaker. Be careful not to touch the acid with your hands!
5. Carefully rinse the egg with tap water and examine it.

By right, the egg should feel harder to the touch as compared to how it was before the experiment. This is because osmosis has taken place- water has moved from a region of higher concentration to that of lower concentration in the egg across a partially permeable membrane.