General Characteristics Of The Compounds Of Alkali Metals
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_03_03 |
Topic Name : General Characteristics Of The Compounds Of Alkali Metals |
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Sub Topic Name : Salts Of Oxo-Acids |
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Introduction
• Oxo-acids are those in which the acidic proton is on a hydroxyl group with an oxo group attached to the same atom e.g., carbonic acid. • The alkali metals form salts with all the oxo-acids. • They are generally soluble in water and thermally stable. • Their carbonates (M2CO3) and in most cases the hydrogencarbonates (MHCO3) also are highly stable to heat. • As the electropositive character increases down the group, the stability of the carbonates and hydrogencarbonates increases. • Lithium carbonate is not so stable to heat.
Pre-Requisites:
Atom, compound, element, acids
Activity:
Baking soda is used to baking.
Real Life Question:
What is sodium bicarbonate used for?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Alkali metals | Group 1 elements. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Box of baking soda, Refrigerator | See what happens when an open box of baking soda is kept inside a fridge having odors from vegetables etc. |
Real life uses :
Baking soda used for baking.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Baking soda | Sodium bicarbonate is used for baking. |
What you learn in Theory:
• TOxo-acids are those in which the acidic proton is on a hydroxyl group with an oxo group attached to the same atom e.g., carbonic acid. • The alkali metals form salts with all the oxo-acids. • They are generally soluble in water and thermally stable. • Their carbonates (M2CO3) and in most cases the hydrogencarbonates (MHCO3) also are highly stable to heat. • As the electropositive character increases down the group, the stability of the carbonates and hydrogencarbonates increases. • Lithium carbonate is not so stable to heat.
What you learn in Practice:
Sodium bicarbonate is used as baking soda for cooking and baking.