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Some Important Compounds Of Boron
Chapter Name : The P- Block Elements
Sub Topic Code : 102_11_11_04_02
Topic Name : Some Important Compounds Of Boron
Sub Topic Name : Orthoboric Acid
Introduction

• Orthoboric acid, H3BO3 is a white crystalline solid, with soapy touch. • It is sparingly soluble in water but highly soluble in hot water. • It can be prepared by acidifying an aqueous solution of borax. • It is also formed by the hydrolysis (reaction with water or dilute acid) of most boron compounds (halides, hydrides, etc.). • It has a layer structure in which planar BO3 units are joined by hydrogen bonds • Boric acid is a weak monobasic acid. • It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion. • On heating, orthoboric acid above 370K forms metaboric acid, HBO2 which on further heating yields boric oxide, B2O3.

Pre-Requisites:

Elements, periodic table, Group

Activity:

• Group 13 has aluminium, boron which are important industrial elements.

Real Life Question:

What is boron used for?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
P block elements Have the last electron in the outermost p orbital.
Learning aids / Gadgets
Gadgets How it can be used
Boric acid Used for killing insects.
Real life uses :

• An important compound of boron is boric acid used for killing insects.

Places to visit :

Chemistry lab, kitchen.

Practical examples around us
Examples Explainations
Boric acid Used for killing insects.
What you learn in Theory:

• Orthoboric acid, H3BO3 is a white crystalline solid, with soapy touch. • It is sparingly soluble in water but highly soluble in hot water. • It can be prepared by acidifying an aqueous solution of borax. • It is also formed by the hydrolysis (reaction with water or dilute acid) of most boron compounds (halides, hydrides, etc.). • It has a layer structure in which planar BO3 units are joined by hydrogen bonds • Boric acid is a weak monobasic acid. • It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion. • On heating, orthoboric acid above 370K forms metaboric acid, HBO2 which on further heating yields boric oxide, B2O3.

What you learn in Practice:

• Group 13 has aluminium, boron which are important industrial elements.

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