write down the difference between strong acid and weak base
Answers
Strong acids will dissociate completely to produce H+ ions. pH values will be around 0 to 1. Most of the inorganic acids are strong acids in nature. Ex: H2SO4, HNO3, HCl…etc
Weak acids
Weak Acids will dissociate partially to produce H+ ions. pH values will be around 5 to 7. All organic acids are weak acids.Ex: CH3COOH, HNO2, H2SO3…etc
Acids dissolve in water to form H+ ions.
Bases dissolve in water to form OH- ions.
Lets take a look at acids - A strong acid (HCl) vs a weak acid (CH3COOH).
A strong acid will fully dissociate in water to form H+ ions.
HCl + H2O---> H3O+ + Cl-
This reaction is non-reversible. After dissolution, only a very very minute concentration of HCl itself remains in the solution, as most of the diluted HCl has dissolved into ions.
Ka = [H+] [Cl-] / [HCl]
A weak acid, however undergoes a reversible reaction as it only partially dissociates.
CH3COOH + H2O <---> CH3COO- + H3O+
Ka = [CH3COO-] [H3O+] / [CH3COOH]
As Ka is a constant, as more CH3COOH is added, by Le Chatelier's Principle, in this reversible reaction, the system will aim to shift the equilibrium as such to reverse the change. Therefore, less CH3COOH than added will dissociate into its constituent ions.
Ionic equilibrium can be explained by http://www.chem1.com/acad/webtex...
The reason why one reaction is reversible and the other is not can be explained by http://chemed.chem.purdue.edu/ge...
The favourability of a reaction (whether forward or reverse) will depend largely on the temperature and change in entropy.
The same applied for bases. The only difference is that the base dissociates to form OH- ions instead.
Strong and weak bases will depend likewise on whether the reaction is reversible (there are exceptions to this of course)
NaOH + H2O ---> Na+ + OH- + H2O
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