Question

N
Determine the normality of given HCl solution by titrating it against NaOH solution.
20
Practically

Answer 1

Answer:

• 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

• Fill the bulb with the NaOH solution of the known normality and mark the normality of NaOH as N₂

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

• 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

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

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