- #1
APool555
- 15
- 0
C_6H_5OH acts as a weak acid and C_6H_5NH_2 acts as a weak base in water. Write equalibrium expressions for K_a and K_b.
Last edited:
A weak acid is an acid that does not completely dissociate in water, meaning that only a small fraction of the molecules break apart into ions. A strong acid, on the other hand, is an acid that completely dissociates in water, producing a high concentration of hydrogen ions.
One example of a weak acid is acetic acid (CH3COOH). It is commonly found in vinegar and only partially dissociates in water, producing both hydrogen ions and acetate ions.
The acid dissociation constant (Ka) is equal to the concentration of the products (H+ and conjugate base) divided by the concentration of the reactant (weak acid). This can be represented by the equation Ka = [H+][A-]/[HA].
The acid dissociation constant (Ka) is a measure of the strength of a weak acid. A higher Ka value indicates a stronger acid, meaning that more hydrogen ions will be produced in water.
The equilibrium constant (Ka) for a weak acid is temperature-dependent. An increase in temperature will shift the equilibrium to the left, decreasing the concentration of hydrogen ions and lowering the Ka value. A decrease in temperature will shift the equilibrium to the right, increasing the concentration of hydrogen ions and increasing the Ka value.