Some Important Compounds Of Calcium
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_10_03 |
Topic Name : Some Important Compounds Of Calcium |
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Sub Topic Name : Calcium Carbonate |
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Introduction
• Calcium carbonate occurs in nature in several forms like limestone, chalk, marble etc. • It can be prepared by passing carbon dioxide through slaked lime or by the addition of sodium carbonate to calcium chloride. • Calcium carbonate is a white fluffy powder. • It is almost insoluble in water. • When heated to 1200 K, it decomposes to evolve carbon dioxide. • It reacts with dilute acid to liberate carbon dioxide. • It is used as a building material in the form of marble and in the manufacture of quick lime. • Calcium carbonate along with magnesium carbonate is used as a flux in the extraction of metals such as iron. • Specially precipitated CaCO3 is extensively used in the manufacture of high quality paper. • It is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and filler in cosmetics.
Pre-Requisites:
Alkali earth metals, elements, periodic table
Activity:
Calcium carbonate is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and filler in cosmetics.
Real Life Question:
What is Taj Mahal made of?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Marble, chalk | Calcium carbonate. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Look at the elements present in the group 2 of the periodic table. |
Real life uses :
Used for building material, toothpaste, antacid.
Places to visit :
Construction site.
Practical examples around us
| Examples | Explainations |
|---|---|
| Antacid, toothpaste | Calcium carbonate used as an ingredient for antacid and toothpaste. |
What you learn in Theory:
• Calcium carbonate occurs in nature in several forms like limestone, chalk, marble etc. • It can be prepared by passing carbon dioxide through slaked lime or by the addition of sodium carbonate to calcium chloride. • Calcium carbonate is a white fluffy powder. • It is almost insoluble in water. • When heated to 1200 K, it decomposes to evolve carbon dioxide. • It reacts with dilute acid to liberate carbon dioxide. • It is used as a building material in the form of marble and in the manufacture of quick lime. • Calcium carbonate along with magnesium carbonate is used as a flux in the extraction of metals such as iron. • Specially precipitated CaCO3 is extensively used in the manufacture of high quality paper. • It is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and filler in cosmetics.
What you learn in Practice:
Calcium carbonate is an important building material.