How many grams of solid naoh are required to prepare a 400ml of a 5n solution? show your work!

The mass of solid NaOH required is 80 g

Explanation:

Equivalent weight is calculated by dividing the molecular weight by n factor. The equation used is:

where,

n = acidity for bases = 1 (For NaOH)

Molar mass of NaOH = 40 g/mol

Putting values in above equation, we get:

Normality is defined as the umber of gram equivalents dissolved per liter of the solution.

Mathematically,

Or,

        ......(1)

We are given:

Given mass of NaOH = ?

Equivalent mass of NaOH = 40 g/eq

Volume of solution = 400 mL

Normality of solution = 5 eq/L

Putting values in equation 1, we get:

Hence, the mass of solid NaOH required is 80 g