Question

Determine the normality of the given hcl solution by titrating it against N/20 Naoh

Answer 1

Normality of the given HCl solution can be determined by the following method:

1. First we took 10 mL or 20 mL of the given unknown normality HCl solution in the conical flask and mark this volume as V₁.

2. Fill the burette with the NaOH solution of the known normality and mark the normality of NaOH as N₂

3. Add 2-3 drops of the phenolphthalein indicator in the conical flask.

4. Then titrate the HCl with the NaOH as colour of the solution becomes pink, noted the volume of NaOH used as V₂.

Now normality of HCl can be calculated as follows:

N_{1}V_{1}=N_{2}V_{2}

N₁, is the unknown normality of the HCl solution.

So now after having values of N₁, V₁, V₂ normality of the HCl solution can be calculated.

Here as normality of NaOH is given as N/20

So the equation for the calculation of normality of HCl will become:

\frac{1\times V_{2}}{V_{1}\times 20}.