The titration of 10.00 ml of an hcl solution of unknown concentration requires 120.54 ml of a 0.100 m naoh solution to reach the equivalence point. what is the concentration of the unknown hcl solution?

Concentration of HCl is 1.2054 M

Explanation:

Acid-base titration is a type of qualitative analysis in which the concentration of the unknown acid/base is determined by treating it with a known concentration of base/acid. Indicators are used to determine the end point or the equivalence point (when all the acid/base is neutralized by base/acid).

At the end point,

Moles of acid = Moles of base

Since,

Molarity of a solution is given by the moles of solute per liter of the solution  

i.e.,

Molarity = moles of solute / volume of solution (in L)

moles = Molarity * Volume

moles = M * V  

M₁V₁ ( acid )= M₂V₂( base )

Where,

M₁ is the molarity of the acid

V₁ is the volume of the acid    

M₂ is the molarity of the base

V₂ is the total volume of the base

From the question,

M₁ =  ?

M₂ = 0.100 M

V₁ = 10.00 mL

V₂ = 120.54 mL

Using the above mentioned formula

M₁V₁ ( acid )= M₂V₂( base )

M₁ * 10.00mL = 0.100 M * 120.54 mL

M₁ = 1.2054 M

Hence, the concentration of of HCl is 1.2054 M

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.