Question

How to calculate normality of sodium thiosulphate?

Answer 1

Normality (N) of sodium thiosulphate can be calculated using the formula:


N=1000.m/v. 248. 18

Answer 2

Answer:

The Normality of Sodium thiosulphate is calculated using the following formula:

$N = \frac{1000*m}{V * 248.18}$......(1)

where, m - mass of sodium thiosulphate present in Vml of the solution.

    248.18 - equivalent weight of sodium thiosulphate

            N - Normality of Sodium thiosulphate

Normality refers to the number of equivalent weights per 1000 mL of the solution. It is estimated accurately by iodometric titration method and is calculated using the formula:

$N = \frac{N_{1}* V_{1} }{V}$........(2)

where, $N_{1}$ - Normality of potassium dichromate

            $V_{1}$ - Volume of potassium dichromate

            V - Volume of Sodium thiosulphate.

In the Iodometric titration method, a standard solution of potassium dichromate is reacted with excess potassium iodide solution and the liberated iodine is titrated against sodium thiosulphate solution.

Using equation (2) the normality of sodium thiosulphate is calculated.

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