TO MAKE A BASE

OBJECTIVE: TO MAKE A BASE

MATERIALS REQUIRED

1. Magnessium Ribbon                      2. Porcelain Basin

3. Litmus Paper (Blue)                       4. Phenolphthalein

5. Beaker                                          6.Water

THEORY

Some metals like magnesium, iron, sodium when burn in oxygen, react with oxygen to form their oxides which dissolve in water to form alkalis. These oxides are called basic oxides. Magnesium metal burns in oxygen and reacts with oxygen to form magnesium oxide.

Magnesium + Oxygen                Magnesium oxide

2 Mg + 0₂                     2MgO

Magnesium oxide dissolves in water to some extent to form magnesium hydroxide, an alkali.

Magnesium Oxide + Water              Magnesium hydroxide

          MgO  +   H₂O                         Mg (OH)₂

OBSERVATION

Magnesium reacts with oxygen present in air and forms a white substance called magnesium oxide. This magnesium oxide is a base (MgO). After dissolving in water it forms an alkali, Mg (OH)_2.Which turned RED litmus paper into BLUE. When few drops of PHENOLPHTHALEIN were added, it was turned into pink.

CONCLUSION

During this experiment we made a base.

TO VERIFY ARCHIMEDES' PRINCIPLE

OBJECTIVE: TO VERIFY ARCHIMEDES' PRINCIPLE

MATERIALS REQUIRED

1. Spring balance                 2. Measuring cylinder

3. Water trough                   4. A piece of thread

5. A piece of stone

THEORY

Archimedes Principle states ‘‘when a body is immersed partially or completely in fluid, it experiences an apparent loss in weight due to upthrust which is equal to the weight of the fluid displaced by it.”

Let weight of a body in air = W₁

Weight of the body in water = W₂

Loss in weight of the body (W₃) = W₁ - W₂

Weight of displaced water by the body = W₄

Loss in weight of the body = weight of displaced liquid

i.e.                     W₃ = W₄

OBSERVATION

Let weight of a body in air (W₁) = ………..

Weight of the body in water (W₂) = ………..

Loss in wt of the body  = ……….. - ………..

    = ………..

Weight of displaced water by the body (W₄) = ……….

Loss in weight of the body = weight of displaced liquid

i.e.                     W₃ = W₄

Instrumental Error : ……………

CONCLUSION

During the experiment we verified Archimedes' principle.