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.

1) We know,

2) Let w be the mass of solute dissolved in W grams of solvent so that the volume of solution is V.

Let M’ be the molar mass of the solute.

Therefore, Molarity

 -------------(1)

And

Molality,

  ----------------(2)

Now, Density,

From equation (1),

  ------------------(3)

And from equation (2),

Therefore,

  --------(4)

Dividing equation (4) by (3)

Or