Question

Calcular la cantidad de NaOH necesaria para preparar medio litro de disolución 2,5 N. (Dato: peso molecular del NaOH = 40 g/mol).

Answer 1

The amount of NaOH required to prepare a solution of 2.5N NaOH.

The molecular mass of NaOH is 40.0g/mol.

Step-by-step explanation:

Since,

NaOH has only one replaceable -OH group.

So, its acidity is one.

Hence,

The molecular mass of NaOH =its equivalent mass

Normality formula can be written as:
`Normality=(mass of solute NaOH)/(its equivalent mass) * (1)/(volume of solution in L) \\`

Substitute the given values in this formula to get the mass of NaOH required.

`2.5N=(mass of NaOH)/(40g/mol) *(1)/(1L) \\mass of NaOH=2.5N*40gmol\\ = 100.0g`

Hence, the mass of NaOH required to prepare 2.5N and 1L. solution is 100g