Answer to Question #98804 in General Chemistry for Booshidha

Question

Chemical and physical properties of cobalt acetate tetrahydrate,nickel acetate tetrahydrate,cobalt oxide,nickel oxide and Nickel-Cobalt mixed metal oxide?

Answer 1

Сobalt acetate tetrahydrate:

$$(CH_3COO)_2Co * 4H_2O$$

Pink-red crystals. Soluble in water. The decomposition temperature 140 degrees Celsius.

Nickel acetate tetrahydrate:

$$(CH_3COO)_2Ni * 4H_2O$$

Light green crystals. Soluble in water. The decomposition temperature is 250 degrees Celsius.

Chemical properties:

• decompose with the release of water (like all crystalline hydrates);
• reacts with solutions of strong acids (e.g. chloride);
• reacts with carbonates.

Cobalt oxide:

$$CoO$$

Water insoluble dark turquoise crystals.

Nickel oxide:

$$NiO$$

The crystalline substance is turquoise. Insoluble in water.

Chemical properties:

• dissolve with the formation of salts in solutions of acids and alkalis:
• reacts with hydrogen to form reduced metal and water;
• reacts and fuses with acid oxides;
• cobalt oxide is oxidized by oxygen when heated to form mixed cobalt oxides.

Nickel-cobalt oxide is a type of alloy that is a composite material. It has special properties (for example, a special value of thermal conductivity).

The chemical properties are associated with increased resistance to oxidation, including corrosion.