Question

When an alkaline earth carbonate is heated, it releases CO₂, leaving the metal oxide. The temperature at which each Group 2A(2) carbonate yields a CO₂ partial pressure of 1 atm is Carbonate Temperature (°C)MgCO₃ 542CaCO₃ 882SrCO₃ 1155BaCO₃ 1360(b) Mixtures of CaCO₃ and MgO are used to absorb dissolved silicates from boiler water. How would you prepare a mixture of CaCO₃ and MgO from dolomite, which contains CaCO₃ and MgCO₃?

Answer 1

We can prepare CaCO₃ and MgO from dolomite.

What is Dolomite?

• Common rock forming mineral is called dolomite.
• It's chemical composition is CaMg(CO₃)₂.
• The component of the sedimentary rock is called dolostone.
• It is the primary component of the metamorphic rock known as dolomitic marble.
• Limestone that contains some dolomite is known as dolomitic limestone.

Dolomite is a mineral which is rarely found in the environment , but dolostones are the minerals which are very commonly found.

Properties of Dolomite:

• The trigonal-rhombohedral system is used to crystallise dolomite
• It forms crystals that are white, tan, green, or pink in colour.
• Dolomite is a double carbonate of calcium and magnesium ions arranged in an alternating structural structure.
• Granular dolomite is a medium to dark grey, brown, or white granular dolomite found in rocks.
• The lustre varies from dull to subvitreous. Dolomite, like calcite, cleaves into six-sided polyhedrons with diamond-shaped faces.
• Dolomite vein grains may be several centimetres in diameter.

Uses of Dolomite:

• Ornamental stone is used as Dolomite, and a magnesium oxide source, as well as used in the Pidgeon magnesium production process.
• Dolomite is often used in place where calcite limestone is used as as a flux for the smelting of iron and steel when calcite limestone is not available or very expensive.
• Therefore, it is also called dolomite limestone.
• Dolomite and dolomitic limestone are often used in horticulture as a pH buffer and magnesium source in soils .
• Calcined dolomite is also used as a catalyst invery high-temperature gasification of biomass in order to kill tar.

Preparation of  CaCO₃ and MgO from dolomite:

• Dolomite is a double salt which consists of calcium carbonate (CaCO3) and magnesium carbonate (MgO) and it is one of the two forms of limestone.
• This dolomite is  found in the Bangkalan area, which only used in landfill and used to make light stone. Existence the great potential for dolomite as a biomaterial then in this research was carried by making CaCO3/MgO from dolomite using a simple calcination method at 600°C, 700°C and 800°C for one hour From the results of XRD found that the CaCO3/MgO phase was formed optimally at a temperature of 700°C.

Thus from the above conclusion we can say that, we can prepare CaCO₃ and MgO from dolomite.

Learn more about Dolomite here :brainly.com/question/10283539

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