You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.95. You determine that the concentration of the unknown acid was 0.1224 M. You also determined that the acid was monoprotic (HA). What is the K_a and pK_a of your unknown acid

is dissociation constant and the value of is 4.98.

Explanation:

The pH of the solution = 2.95 M

..[1]

Concentration of unknown monoprotic acid = C = 0.1224 M

Initially

C                  0         0

At equilibrium

(C-x)              x         x

The expression of a dissociation reaction can be written as;

 ( from [1])

The value of :

is dissociation constant and the value of is 4.98.

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

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