Easy Understanding About Theories Of Acids & Bases

Chemistry Tutorial

Easy Understanding About Theories Of Acids & Bases

Intro

An acid always reacts with a base.
There are 3 theories of Acids and Bases:
1. Arrhenius Theory is related to hydrogen ions,H+ as acid and hydroxide ions,OH-as base.
2. Bronsted-Lowry Theory is related to proton,H+,donor as acid and any proton acceptor as a base like OH-, H2O,Cl-,NH3,etc.
3.Lewis Acid-Base Theory is related electron pair acceptor like H+, BF3 as an acid and electron pair donor like OH-, NH3 as a base.

Sample Problem

1.Arrhenius Theory:
H+ ion from HCl acid combines with OH- ion from NaOH to form sodium chloride,NaCl and water, H2O.
HCl + NaOH → NaCl + H2O
2.Bronsted-Lowry Theory:
H+ ion from HCl acid combines with a proton acceptor like ammonia, NH3 to give ammonium chloride, NH4Cl.
HCl + NH3 → NH4Cl
3.Lewis Acid-Base Theory:
Boron trifloride,BF3 is an electron deficient molecule.So it behaves as an acid according to the Lewis structure concept.
Ammonia,NH3 has one lone pair of non-bonding electrons according to the Lewis structure concept. So, it acts an electron pair donor to behave as a base.
BF3 + NH3 → BF3→NH3

Solution

In short, theories of Acids and Bases can be summarized by way of Chemical equations:
1.Arrhenius Theory:
HCl + NaOH → NaCl + H2O
Acid Base
2.Bronsted-Lowry Theory:
HCl + NH3 → NH4Cl
Acid Base
3.Lewis Acid-Base Theory:
BF3 + NH3 → BF3→NH3 ( You can refer to Lewis structure)
Acid Base
Still there are more to discuss elaborately.
Prof Thirunavukkarasu Chandrasekaran is ready to help for
100% success achievement by systematic,inspiring tutoring and simple learning techniques in the topic,Theories of Acids and Bases related to concepts, problems etc.
Email:ctarassu27@yahoo.com



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