Properties of Oxides - to Compare the Properties of Metallic and Nonmetallic Oxides

Properties of Oxides

Purpose: To compare the properties of metallic and nonmetallic oxides.

Hypothesis:

Nonmetallic oxides make acids. Metallic oxides make bases.

Equipment:

Magnesium oxide (MgO)

Calcium oxide (CaO)

Phenolphthalein solution

Bromothymol solution

Water

Well plate

Eye droppers

Beaker

Baking soda (NaHCO3)

Vinegar (CH3COOH)

2 flasks

Stopper

Procedure:

Calcium oxide was placed in two different places on the well plate.

Phenolphthalein solution was added to one of spots containing the metal oxide. Bromothymol was added to the other.

The reactions were observed and recorded.

Magnesium was burned to make magnesium oxide.

The powder was placed in two different spots on the well plate.

Bromothymol and phenolphthalein solution were added to magnesium oxide.

The reactions were observed and recorded.

A flask was filled with water and bromothymol was added to it.

The other flask was filled with vinegar and baking soda.

The stopper with the 90o tube attached to it was placed on top of the flask filled with vinegar and baking soda. The end of the tube was placed in the other flask. The reactions were observed and recorded.

Observations:

Solution

Oxide

Phenolphthalein

Bromothymol

Calcium oxide

-calcium oxide turned pink

-became a base

-calcium oxide remained blue

Magnesium oxide

-magnesium oxide turned pink

-became a base

-magnesium oxide turned pink

-became a base