Question

Derive the following:

1) Normality = (%age x density x 10) / Equivalent mass of solute

2) Relation between molarity and molality when density and molar mass of the solute is given.

Answer 1



Vikrant Gupta asked in Chemistry

Derive a relation among molarity,molality,density gm/litre and molar mass of solute.

 0

 Follow0



Kanika answered this
1916 helpful votes in Chemistry, Class XII-Science

Let us take M = Molarity of solution

V = Volume of solution in L

ρ = density of solution

na and nb be the number of moles of solvent and solute, respectively.

Ma and Mb be the molar masses of solvent and solute, respectively.

Wa = weight of solvent, Wb = weight of solute



On substituting equation (1) in equation (2), we get



On Substituting equation (4) and equation (5) in equation (3), we get



On rearranging equation (6), we get



Substitute equation (7) in equation (I)



Taking V in common, we get,



https://m.meritnation.com/ask-answer/question/derive-a-relation-among-molarity-molality-density-gm-litre-a/some-basic-concepts-of-chemistry/2404522#